Microchip MCP4902-E/ST 8/10/12-bit dual voltage output digital-to-analog converter with spi interface Datasheet

MCP4902/4912/4922
8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter
with SPI Interface
Features
Description
•
•
•
•
•
•
The MCP4902/4912/4922 devices are dual 8-bit,
10-bit, and 12-bit buffered voltage output
Digital-to-Analog Converters (DACs), respectively. The
devices operate from a single 2.7V to 5.5V supply with
SPI compatible Serial Peripheral Interface. The user
can configure the full-scale range of the device to be
VREF or 2 * VREF by setting the Gain Selection Option
bit (gain of 1 of 2).
•
•
•
•
•
•
MCP4902: Dual 8-Bit Voltage Output DAC
MCP4912: Dual 10-Bit Voltage Output DAC
MCP4922: Dual 12-Bit Voltage Output DAC
Rail-to-Rail Output
SPI Interface with 20 MHz Clock Support
Simultaneous Latching of the Dual DACs
with LDAC pin
Fast Settling Time of 4.5 µs
Selectable Unity or 2x Gain Output
External Voltage Reference Inputs
External Multiplier Mode
2.7V to 5.5V Single-Supply Operation
Extended Temperature Range: -40°C to +125°C
Applications
•
•
•
•
•
Set Point or Offset Trimming
Precision Selectable Voltage Reference
Motor Control Feedback Loop
Digitally-Controlled Multiplier/Divider
Calibration of Optical Communication Devices
Related Products(1)
P/N
DAC
No. of
Resolution ChannelS
Voltage
Reference
(VREF)
The user can shut down both DAC channels by using
SHDN pin or shut down the DAC channel individually
by setting the Configuration register bits. In Shutdown
mode, most of the internal circuits in the shutdown
channel are turned off for power savings and the output
amplifier is configured to present a known high
resistance output load (500 ktypical.
The devices include double-buffered registers,
allowing synchronous updates of two DAC outputs,
using the LDAC pin. These devices also incorporate a
Power-on Reset (POR) circuit to ensure reliable powerup.
The devices utilize a resistive string architecture, with
its inherent advantages of low DNL error and fast
settling time. These devices are specified over the
extended temperature range (+125°C).
The devices provide high accuracy and low noise
performance for consumer and industrial applications
where calibration or compensation of signals (such as
temperature, pressure and humidity) are required.
MCP4801
8
1
MCP4811
10
1
MCP4821
12
1
MCP4802
8
2
MCP4812
10
2
MCP4822
12
2
VDD 1
14 VOUTA
13 VREFA
Internal
(2.048V)
The MCP4902/4912/4922 devices are available in the
PDIP, SOIC and TSSOP packages.
Package Types
MCP4901
8
1
NC 2
MCP4911
10
1
CS 3
External
SCK 4
MCP4921
12
1
MCP4902
8
2
SDI 5
2
NC 6
2
NC 7
MCP4912
MCP4922
10
12
Note 1: The products listed here have similar AC/
DC performances.
 2010 Microchip Technology Inc.
MCP49X2
14-Pin PDIP, SOIC, TSSOP
12 VSS
11 VREFB
10 VOUTB
9 SHDN
8 LDAC
MCP4902: 8-bit dual DAC
MCP4912: 10-bit dual DAC
MCP4922: 12-bit dual DAC
DS22250A-page 1
MCP4902/4912/4922
Block Diagram
LDAC
CS
SDI
SCK
Interface Logic
Input
Register A
Input
Register B
String
DACB
String
DACA
Buffer
Gain
Logic
VDD
VSS
DACB
Register
DACA
Register
VREF A
Power-on
Reset
VREF B
Buffer
Gain
Logic
Output
Op Amps
Output
Logic
VOUTA
DS22250A-page 2
SHDN
VOUTB
 2010 Microchip Technology Inc.
MCP4902/4912/4922
1.0
ELECTRICAL
CHARACTERISTICS
† Notice: Stresses above those listed under “Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of
the device at those or any other conditions above those
indicated in the operational listings of this specification
is not implied. Exposure to maximum rating conditions
for extended periods may affect device reliability.
Absolute Maximum Ratings †
VDD....................................................................... 6.5V
All inputs and outputs w.r.t ..... VSS –0.3V to VDD+0.3V
Current at Input Pins ......................................... ±2 mA
Current at Supply Pins .................................... ±50 mA
Current at Output Pins .................................... ±25 mA
Storage temperature .......................... -65°C to +150°C
Ambient temp. with power applied ..... -55°C to +125°C
ESD protection on all pins 4 kV (HBM), 400V (MM)
Maximum Junction Temperature (TJ)................+150°C
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 5V, VSS = 0V, VREF = 2.048V, Output Buffer Gain (G) = 2x, RL = 5 k to
GND, CL = 100 pF TA = -40 to +85°C. Typical values are at +25°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Power Requirements
Operating Voltage
VDD
2.7
—
5.5
V
Operating CurrentInput Current
IDD
—
350
700
µA
—
250
500
µA
Hardware Shutdown Current
ISHDN
—
0.3
2
µA
Power-on Reset circuit is turned
off
Software Shutdown Current
ISHDN_SW
—
3.3
6
µA
Power-on Reset circuit stays on
Power-on-Reset Threshold
VPOR
—
2.0
—
V
VDD = 5V
VDD = 3V
VREF input is unbuffered, all digital
inputs are grounded, all analog
outputs (VOUT) are unloaded.
Code = 000h.
DC Accuracy
MCP4902
Resolution
n
8
—
—
Bits
INL Error
INL
-1
±0.125
1
LSb
DNL
DNL
-0.5
±0.1
+0.5
LSb
Note 1
MCP4912
Resolution
n
10
—
—
Bits
INL Error
INL
-3.5
±0.5
3.5
LSb
DNL
DNL
-0.5
±0.1
+0.5
LSb
Note 1
MCP4922
Resolution
n
12
—
—
Bits
INL Error
INL
-12
±2
12
LSb
DNL
DNL
-0.75
±0.2
+0.75
LSb
Note 1
VOS
—
±0.02
1
% of
FSR
Code = 0x000h
Offset Error
Note 1:
2:
Guaranteed monotonic by design over all codes.
This parameter is ensured by design, and not 100% tested.
 2010 Microchip Technology Inc.
DS22250A-page 3
MCP4902/4912/4922
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, VDD = 5V, VSS = 0V, VREF = 2.048V, Output Buffer Gain (G) = 2x, RL = 5 k to
GND, CL = 100 pF TA = -40 to +85°C. Typical values are at +25°C.
Parameters
Sym
Min
Typ
Max
Units
VOS/°C
—
0.16
—
ppm/°C
-45°C to 25°C
—
-0.44
—
ppm/°C
+25°C to 85°C
gE
—
-0.10
1
% of
FSR
G/°C
—
-3
—
ppm/°C
Input Range – Buffered
Mode
VREF
0.040
—
VDD – 0.040
V
Input Range – Unbuffered
Mode
VREF
0
—
VDD
V
Input Impedance
RVREF
—
165
—
k
Input Capacitance –
Unbuffered Mode
CVREF
—
7
—
pF
Multiplier Mode -3 dB
Bandwidth
fVREF
—
450
—
kHz
VREF = 2.5V ±0.2Vp-p,
Unbuffered, G = 1x
fVREF
—
400
—
kHz
VREF = 2.5V ±0.2 Vp-p,
Unbuffered, G = 2x
THDVREF
—
-73
—
dB
VREF = 2.5V ±0.2Vp-p,
Frequency = 1 kHz
Output Swing
VOUT
—
0.01 to
VDD – 0.04
—
V
Accuracy is better than 1 LSb for
VOUT = 10 mV to (VDD – 40 mV)
Phase Margin
m
—
66
—
degrees
Slew Rate
SR
—
0.55
—
V/µs
Short Circuit Current
ISC
—
15
24
mA
tsettling
—
4.5
—
µs
Offset Error Temperature
Coefficient
Gain Error
Gain Error Temperature
Coefficient
Conditions
Code = 0xFFFh, not including offset error
Input Amplifier (VREF Input)
Multiplier Mode –
Total Harmonic Distortion
Note 2
Code = 2048
VREF = 0.2V p-p, f = 100 Hz and
1 kHz
Unbuffered Mode
Output Amplifier
Settling Time
Within 1/2 LSb of final value from
1/4 to 3/4 full-scale range
Dynamic Performance (Note 2)
DAC-to-DAC Crosstalk
—
10
—
nV-s
Major Code Transition Glitch
—
45
—
nV-s
Digital Feedthrough
—
10
—
nV-s
Analog Crosstalk
—
10
—
nV-s
Note 1:
2:
1 LSb change around major carry
(0111...1111 to 1000...0000)
Guaranteed monotonic by design over all codes.
This parameter is ensured by design, and not 100% tested.
DS22250A-page 4
 2010 Microchip Technology Inc.
MCP4902/4912/4922
ELECTRICAL CHARACTERISTIC WITH EXTENDED TEMPERATURE
Electrical Specifications: Unless otherwise indicated, VDD = 5V, VSS = 0V, VREF = 2.048V, Output Buffer Gain (G) = 2x, RL = 5 k to
GND, CL = 100 pF. Typical values are at +125°C by characterization or simulation.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Operating Voltage
VDD
2.7
—
5.5
V
Operating Current
IDD
—
400
—
µA
VREF input is unbuffered, all digital inputs are grounded, all analog
outputs (VOUT) are unloaded.
Code=000h
ISHDN
—
1.5
—
µA
POR circuit is turned-off
—
5
—
µA
POR circuit stays turned-on
—
1.85
—
V
—
—
Power Requirements
Hardware Shutdown
Current
Software Shutdown Current ISHDN_SW
Power-On Reset threshold
VPOR
DC Accuracy
MCP4902
Resolution
n
8
Bits
INL Error
INL
±0.25
LSb
DNL
DNL
±0.2
LSb
Note 1
MCP4912
Resolution
n
10
—
—
Bits
INL Error
INL
±1
LSb
DNL
DNL
±0.2
LSb
Note 1
MCP4922
Resolution
n
12
—
—
Bits
INL Error
INL
±4
LSb
DNL
DNL
±0.25
LSb
Offset Error
VOS
—
±0.02
—
% of FSR
VOS/°C
—
-5
—
ppm/°C
gE
—
-0.10
—
% of FSR
G/°C
—
-3
—
ppm/°C
Input Range – Buffered
Mode
VREF
—
0.040 to
VDD – 0.040
—
V
Input Range – Unbuffered
Mode
VREF
0
—
VDD
V
Input Impedance
RVREF
—
174
—
k
Input Capacitance –
Unbuffered Mode
CVREF
—
7
—
pF
Offset Error Temperature
Coefficient
Gain Error
Gain Error Temperature
Coefficient
Note 1
Code 0x000h
+25°C to +125°C
Code = 0xFFFh, not including offset error
Input Amplifier (VREF Input)
Note 1:
2:
Note 1
Code = 2048,
VREF = 0.2V p-p, f = 100 Hz and
1 kHz
Unbuffered mode
Guaranteed monotonic by design over all codes.
This parameter is ensured by design, and not 100% tested.
 2010 Microchip Technology Inc.
DS22250A-page 5
MCP4902/4912/4922
ELECTRICAL CHARACTERISTIC WITH EXTENDED TEMPERATURE (CONTINUED)
Electrical Specifications: Unless otherwise indicated, VDD = 5V, VSS = 0V, VREF = 2.048V, Output Buffer Gain (G) = 2x, RL = 5 k to
GND, CL = 100 pF. Typical values are at +125°C by characterization or simulation.
Parameters
Sym
Min
Typ
Max
Units
fVREF
—
450
—
kHz
VREF = 2.5V ±0.1 Vp-p,
Unbuffered, G = 1x
fVREF
—
400
—
kHz
VREF = 2.5V ±0.1 Vp-p,
Unbuffered, G = 2x
THDVREF
—
—
—
dB
VREF = 2.5V ±0.1Vp-p,
Frequency = 1 kHz
Output Swing
VOUT
—
0.01 to
VDD – 0.04
—
V
Accuracy is better than 1 LSb for
VOUT = 10 mV to (VDD – 40 mV)
Phase Margin
m
—
66
—
degrees
Slew Rate
SR
—
0.55
—
V/µs
Short Circuit Current
ISC
—
17
—
mA
tsettling
—
4.5
—
µs
DAC to DAC Crosstalk
—
10
—
nV-s
Major Code Transition
Glitch
—
45
—
nV-s
Digital Feedthrough
—
10
—
nV-s
Analog Crosstalk
—
10
—
nV-s
Multiplying Mode
-3 dB Bandwidth
Multiplying Mode – Total
Harmonic Distortion
Conditions
Output Amplifier
Settling Time
Within 1/2 LSb of final value from
1/4 to 3/4 full-scale range
Dynamic Performance (Note 2)
Note 1:
2:
1 LSb change around major carry
(0111...1111 to
1000...0000)
Guaranteed monotonic by design over all codes.
This parameter is ensured by design, and not 100% tested.
DS22250A-page 6
 2010 Microchip Technology Inc.
MCP4902/4912/4922
AC CHARACTERISTICS (SPI TIMING SPECIFICATIONS)
Electrical Specifications: Unless otherwise indicated, VDD= 2.7V – 5.5V, TA= -40 to +125°C.
Typical values are at +25°C.
Parameters
Sym
Min
Typ
Max
Units
Schmitt Trigger High-Level
Input Voltage (All digital input
pins)
VIH
0.7 VDD
—
—
V
Schmitt Trigger Low-Level
Input Voltage
(All digital input pins)
VIL
—
—
0.2 VDD
V
VHYS
—
0.05 VDD
—
V
Input Leakage Current
ILEAKAGE
-1
—
1
A
SHDN = LDAC = CS = SDI =
SCK + VREF = VDD or VSS
Digital Pin Capacitance
(All inputs/outputs)
CIN,
COUT
—
10
—
pF
VDD = 5.0V, TA = +25°C,
fCLK = 1 MHz (Note 1)
Clock Frequency
FCLK
—
—
20
MHz
Clock High Time
tHI
15
—
—
ns
Note 1
tLO
15
—
—
ns
Note 1
tCSSR
40
—
—
ns
Applies only when CS falls with
CLK high. (Note 1)
tSU
15
—
—
ns
Note 1
Data Input Hold Time
tHD
10
—
—
ns
Note 1
SCK Rise to CS Rise Hold
Time
tCHS
15
—
—
ns
Note 1
CS High Time
tCSH
15
—
—
ns
Note 1
LDAC Pulse Width
tLD
100
—
—
ns
Note 1
LDAC Setup Time
tLS
40
—
—
ns
Note 1
tIDLE
40
—
—
ns
Note 1
Hysteresis of Schmitt Trigger
Inputs
Clock Low Time
CS Fall to First Rising CLK
Edge
Data Input Setup Time
SCK Idle Time before CS Fall
Note 1:
Conditions
TA = +25°C (Note 1)
This parameter is ensured by design and not 100% tested.
tCSH
CS
tIDLE
tCSSR
Mode 1,1
tHI
tLO
tCHS
SCK Mode 0,0
tSU
tHD
SI
MSb in
LSb in
LDAC
tLS
FIGURE 1-1:
tLD
SPI Input Timing Data.
 2010 Microchip Technology Inc.
DS22250A-page 7
MCP4902/4912/4922
TEMPERATURE CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = +2.7V to +5.5V, VSS = GND.
Parameters
Sym
Min
Typ
Max
Units
Specified Temperature Range
TA
-40
—
+125
°C
Operating Temperature Range
TA
-40
—
+125
°C
Storage Temperature Range
TA
-65
—
+150
°C
Thermal Resistance, 14L-PDIP
JA
—
70
—
°C/W
Thermal Resistance, 14L-SOIC
JA
—
120
—
°C/W
Thermal Resistance, 14L-TSSOP
JA
—
100
—
°C/W
Conditions
Temperature Ranges
Note 1
Thermal Package Resistances
Note 1:
The MCP4902/4912/4922 devices operate over this extended temperature range, but with reduced
performance. Operation in this range must not cause TJ to exceed the maximum junction temperature of
150°C.
DS22250A-page 8
 2010 Microchip Technology Inc.
MCP4902/4912/4922
2.0
TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note: Unless otherwise indicated, TA = +25°C, VDD = 5V, VSS = 0V, VREF = 2.048V, Gain = 2x, RL = 5 k, CL = 100 pF.
0.0766
0.3
Absolute DNL (LSB)
DNL (LSB)
0.2
0.1
0
-0.1
-0.2
0.0764
0.0762
0.076
0.0758
0.0756
0.0754
0.0752
0.075
-0.3
0
1024
2048
3072
-40
4096
FIGURE 2-1:
DNL vs. Code (MCP4922).
20
40
60
80
100 120
0.35
Absolute DNL (LSB)
0.1
DNL (LSB)
0
FIGURE 2-4:
Absolute DNL vs.
Temperature (MCP4922).
0.2
0
-0.1
0.3
0.25
0.2
0.15
0.1
0.05
0
-0.2
0
1024
2048
3072
Code (Decimal)
1
4096
125C
85C
INL (LSB)
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
2048
Code (Decimal)
3072
1
2
4096
3
4
5.5
FIGURE 2-3:
DNL vs. Code and VREF,
Gain = 1 (MCP4922).
 2010 Microchip Technology Inc.
4
5
FIGURE 2-5:
Absolute DNL vs. Voltage
Reference (MCP4922).
0.3
1024
3
Voltage Reference (V)
0.4
0
2
25C
FIGURE 2-2:
DNL vs. Code and
Temperature (MCP4922).
DNL (LSB)
-20
Ambient Temperature (ºC)
Code (Decimal)
5
4
3
2
1
0
-1
-2
-3
-4
-5
Ambient Temperature
125C
0
1024
85
2048
3072
Code (Decimal)
25
4096
FIGURE 2-6:
INL vs. Code and
Temperature (MCP4922).
DS22250A-page 9
MCP4902/4912/4922
Note: Unless otherwise indicated, TA = +25°C, VDD = 5V, VSS = 0V, VREF = 2.048V, Gain = 2x, RL = 5 k, CL = 100 pF.
2
2
0
INL (LSB)
Absolute INL (LSB)
2.5
1.5
1
-2
-4
0.5
0
-6
-40
-20
0
20
40
60
80
100
120
0
1024
Ambient Temperature (ºC)
3072
4096
Code (Decimal)
FIGURE 2-7:
Absolute INL vs.
Temperature (MCP4922).
FIGURE 2-10:
Note:
3
INL vs. Code (MCP4922).
Single device graph (Figure 2-10) for
illustration of 64 code effect.
0.2
Temp = - 40oC to +125oC
2.5
0.1
2
DNL (LSB)
Absolute INL (LSB)
2048
1.5
1
0
-0.1
0.5
0
1
2
3
4
-0.2
5
0
Voltage Reference (V)
FIGURE 2-8:
(MCP4922).
Absolute INL vs. VREF
3
1
2
3
384
512 640
Code
768
896 1024
1.5
4
5.5
0.5
1
0
INL (LSB)
INL (LSB)
256
FIGURE 2-11:
DNL vs. Code and
Temperature (MCP4912).
VREF
2
128
-1
-2
o
85 C
-0.5
-1.5
o
-3
1024
FIGURE 2-9:
(MCP4922).
DS22250A-page 10
2048
3072
Code (Decimal)
4096
INL vs. Code and VREF
- 40 C
o
125 C
-4
0
25 C
o
-2.5
-3.5
0
128
256
384
512 640
Code
768
896 1024
FIGURE 2-12:
INL vs. Code and
Temperature (MCP4912).
 2010 Microchip Technology Inc.
MCP4902/4912/4922
Note: Unless otherwise indicated, TA = +25°C, VDD = 5V, VSS = 0V, VREF = 2.048V, Gain = 2x, RL = 5 k, CL = 100 pF.
96
128 160 192 224 256
Code
FIGURE 2-13:
DNL vs. Code and
Temperature (MCP4902).
IDD (μA)
IDD Histogram (VDD = 2.7V).
FIGURE 2-16:
0.5
16
o
14
o
-40 C to +85 C
12
Occurrence
0.25
INL (LSB)
325
64
315
32
305
0
295
-0.06
285
215
-0.04
275
-0.02
265
0
255
0.02
245
Occurrence
DNL (LSB)
0.04
20
18
16
14
12
10
8
6
4
2
0
235
Temp = -40oC to +125oC
225
0.06
0
10
8
6
4
-0.25
2
o
125 C
0
32
64
96
128 160
Code
192
224
400
415
400
385
370
355
340
325
310
295
280
IDD (μA)
256
FIGURE 2-17:
5.0V).
FIGURE 2-14:
INL vs. Code and
Temperature (MCP4902).
IDD Histogram (VDD =
5.5V
5.0V
4.0V
3.0V
2.7V
350
IDD (µA)
265
250
0
-0.5
VDD
300
250
200
-40
-20
FIGURE 2-15:
VDD.
0
20 40 60 80 100 120
Ambient Temperature (ºC)
IDD vs. Temperature and
 2010 Microchip Technology Inc.
DS22250A-page 11
MCP4902/4912/4922
Note: Unless otherwise indicated, TA = +25°C, VDD = 5V, VSS = 0V, VREF = 2.048V, Gain = 2x, RL = 5 k, CL = 100 pF.
2
-0.08
VDD
5.5V
5.0V
4.0V
1
3.0V
2.7V
0.5
5.5V
Gain Error (%)
ISHDN (μA)
1.5
VDD
-0.1
5.0V
-0.12
4.0V
3.0V
2.7V
-0.14
-0.16
0
-40
-20
-40
0
20 40 60 80 100 120
Ambient Temperature (ºC)
FIGURE 2-18:
Hardware Shutdown Current
vs. Ambient Temperature and VDD.
-20
0
20 40 60 80 100 120
Ambient Temperature (ºC)
FIGURE 2-21:
Gain Error vs. Ambient
Temperature and VDD.
6
VDD
4
5.5V
5.0V
4
4.0V
3
3.0V
2.7V
2
VDD
1
VIN Hi Threshold (V)
ISHDN_SW (μA)
5
0
5.0V
3
2.5
4.0V
2
3.0V
2.7V
1.5
1
-40
-20
0
20
40
60
80 100 120
Ambient Temperature (ºC)
-40
FIGURE 2-19:
Software Shutdown Current
vs. Ambient Temperature and VDD.
-20
0
20 40 60 80 100 120
Ambient Temperature (ºC)
FIGURE 2-22:
VIN High Threshold vs
Ambient Temperature and VDD.
0.12
0.08
VDD
0.06
0.04
5.5V
0.02
0
5.0V
4.0V
3.0V
2.7V
-0.02
-40
-20
0
20
40
60
80
100 120
Ambient Temperature (ºC)
FIGURE 2-20:
Offset Error vs. Ambient
Temperature and VDD.
DS22250A-page 12
VIN Low Threshold (V)
1.6
0.1
Offset Error (%)
5.5V
3.5
VDD
1.5
5.5V
1.4
5.0V
1.3
1.2
4.0V
1.1
1
3.0V
2.7V
0.9
0.8
-40
-20
0
20 40 60 80 100 120
Ambient Temperature (ºC)
FIGURE 2-23:
VIN Low Threshold vs
Ambient Temperature and VDD.
 2010 Microchip Technology Inc.
MCP4902/4912/4922
VDD
5.5V
5.0V
4.0V
3.0V
2.7V
-40 -20
0.0045
VOUT_LOW Limit (Y-AVSS)(V)
2.5
2.25
2
1.75
1.5
1.25
1
0.75
0.5
0.25
0
5.5V
0.0035
0.003
5.0V
0.0025
4.0V
3.0V
2.7V
0.002
0.0015
-40 -20
0
20
40
60
80 100 120
Ambient Temperature (ºC)
FIGURE 2-24:
Input Hysteresis vs. Ambient
Temperature and VDD.
FIGURE 2-27:
VOUT Low Limit vs. Ambient
Temperature and VDD.
18
175
VREF_UNBUFFERED Impedance
(kOhm)
5.5V 2.7V
VDD
170
165
160
VDD
17
5.5V
5.0V
4.0V
3.0V
2.7V
16
15
14
13
12
11
10
155
-40 -20
-40
0
20 40 60 80 100 120
Ambient Temperature (ºC)
FIGURE 2-25:
VREF Input Impedance vs.
Ambient Temperature and VDD.
0.045
5.0
0.035
VREF=4.0
4.0V
0.03
0.025
3.0V
2.7V
0.02
VDD
0.015
0.01
0
20 40 60 80 100 120
Ambient Temperature (ºC)
6.0
5.5V
5.0V
0.04
-20
FIGURE 2-28:
IOUT High Short vs. Ambient
Temperature and VDD.
VOUT (V)
VOUT_HI Limit (VDD-Y)(V)
VDD
0.004
0
20 40 60 80 100 120
Ambient Temperature (ºC)
IOUT_HI_SHORTED (mA)
VIN_SPI Hysteresis (V)
Note: Unless otherwise indicated, TA = +25°C, VDD = 5V, VSS = 0V, VREF = 2.048V, Gain = 2x, RL = 5 k, CL = 100 pF.
4.0
Output Shorted to VDD
3.0
2.0
1.0
Output Shorted to VSS
0.005
0.0
0
-40 -20
0
20 40 60 80 100 120
Ambient Temperature (ºC)
FIGURE 2-26:
VOUT High Limit vs. Ambient
Temperature and VDD.
 2010 Microchip Technology Inc.
0
2
FIGURE 2-29:
4
6
8
10
IOUT (mA)
12
14
16
IOUT vs VOUT. Gain = 1x.
DS22250A-page 13
MCP4902/4912/4922
Note: Unless otherwise indicated, TA = +25°C, VDD = 5V, VSS = 0V, VREF = 2.048V, Gain = 2x, RL = 5 k, CL = 100 pF.
VOUT
VOUT
SCK
LDAC
LDAC
Time (1 µs/div)
FIGURE 2-30:
VOUT Rise Time.
Time (1 µs/div)
FIGURE 2-33:
VOUT Rise Time.
VOUT
VOUT
SCK
SCK
LDAC
LDAC
Time (1 µs/div)
VOUT Fall Time.
FIGURE 2-34:
Shutdown.
VOUT
SCK
LDAC
Time (1 µs/div)
FIGURE 2-32:
DS22250A-page 14
VOUT Rise Time Exit
Ripple Rejection (dB)
FIGURE 2-31:
Time (1 µs/div)
VOUT Rise Time.
Frequency (Hz)
FIGURE 2-35:
PSRR vs. Frequency.
 2010 Microchip Technology Inc.
MCP4902/4912/4922
Note: Unless otherwise indicated, TA = +25°C, VDD = 5V, VSS = 0V, VREF = 2.50V, Gain = 2x, RL = 5 k, CL = 100 pF.
0
Attenuation (dB)
-2
-4
-6
-8
-10
-12
100
FIGURE 2-36:
Frequency (kHz)
160
416
672
928
1184
1440
1696
1952
2208
2464
2720
2976
3232
3488
3744
1,000
Multiplier Mode Bandwidth.
-45
qVREF – qVOUT
D=
D=
D=
D=
D=
D=
D=
D=
D=
D=
D=
D=
D=
D=
D=
0
D=
D=
D=
D=
D=
D=
D=
D=
D=
D=
D=
D=
D=
D=
D=
-90
-135
-180
100
FIGURE 2-38:
Frequency (kHz)
160
416
672
928
1184
1440
1696
1952
2208
2464
2720
2976
3232
3488
3744
1,000
Phase Shift.
Note:
Bandwidth (kHz)
Dn • G
VOUT
Attenuation (dB) = 20 log (
- 20 log (
4096 )
VREF )
600
580
560
540
520
500
480
460
440
420
400
G=1
G=2
44
37
88
34
32
32
76
29
20
27
64
24
08
22
52
19
96
16
40
14
84
11
8
92
2
67
6
41
0
16
Worst Case Codes (decimal)
FIGURE 2-37:
Codes.
-3 db Bandwidth vs. Worst
 2010 Microchip Technology Inc.
DS22250A-page 15
MCP4902/4912/4922
NOTES:
DS22250A-page 16
 2010 Microchip Technology Inc.
MCP4902/4912/4922
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
3.1
PIN FUNCTION TABLE
Pin No.
Symbol
Function
1
VDD
Supply Voltage Input (2.7V to 5.5V)
2
NC
No Connection
3
CS
Chip Select Input
4
SCK
Serial Clock Input
5
SDI
Serial Data Input
6
NC
No Connection
7
NC
No Connection
8
LDAC
Synchronization Input. This pin is used to transfer DAC settings (Input Registers)
to the output registers (VOUT)
9
SHDN
Hardware Shutdown Input
10
VOUTB
DACB Output
11
VREFB
DACB Reference Voltage Input (VSS to VDD)
12
VSS
13
VREFA
DACA Reference Voltage Input (VSS to VDD)
14
VOUTA
DACA Output
Ground reference point for all circuitry on the device
Supply Voltage Pins (VDD, VSS)
VDD is the positive supply voltage input pin. The input
supply voltage is relative to VSS and can range from
2.7V to 5.5V. The power supply at the VDD pin should
be as clean as possible for a good DAC performance.
It is recommended to use an appropriate bypass
capacitor of about 0.1 µF (ceramic) to ground. An
additional 10 µF capacitor (tantalum) in parallel is also
recommended to further attenuate high frequency
noise present in application boards.
VSS is the analog ground pin and the current return path
of the device. The user must connect the VSS pin to a
ground plane through a low-impedance connection. If
an analog ground path is available in the application
Printed Circuit Board (PCB), it is highly recommended
that the VSS pin be tied to the analog ground path or
isolated within an analog ground plane of the circuit
board.
3.2
Chip Select (CS)
CS is the Chip Select input, which requires an active
low signal to enable serial clock and data functions.
3.3
Serial Clock Input (SCK)
SCK is the SPI compatible serial clock input pin.
3.4
Serial Data Input (SDI)
3.5
Latch DAC Input (LDAC)
LDAC (latch DAC synchronization input) pin is used to
transfer the input latch registers to their corresponding
DAC registers (output latches, VOUT). When this pin is
low, both VOUTA and VOUTB are updated at the same
time with their input register contents. This pin can be
tied to low (VSS) if the VOUT update is desired at the
rising edge of the CS pin. This pin can be driven by an
external control device such as an MCU I/O pin.
3.6
Hardware Shutdown Input (SHDN)
SHDN is the hardware shutdown input pin. When this
pin is low, both DAC channels are shut down. DAC
output is not available during the shutdown.
3.7
Analog Outputs (VOUTA, VOUTB)
VOUTA is the DAC A output pin, and VOUTB is the DAC
B output pin. Each output has its own output amplifier.
The DAC output amplifier of each channel can drive the
output pin with a range of VSS to VDD.
3.8
Voltage Reference Inputs
(VREFA, VREFB)
VREFA is the voltage reference input for DAC channel
A, and VREFB is the reference input for DAC channel B.
The reference on these pins is utilized to set the
reference voltage on the string DAC. The input signal
can range from VSS to VDD. These pins can be tied to
VDD.
SDI is the SPI compatible serial data input pin.
 2010 Microchip Technology Inc.
DS22250A-page 17
MCP4902/4912/4922
NOTES:
DS22250A-page 18
 2010 Microchip Technology Inc.
MCP4902/4912/4922
4.0
GENERAL OVERVIEW
The MCP4902, MCP4912 and MCP4922 are dual
voltage-output 8-bit, 10-bit and 12-bit DAC devices,
respectively. These devices include input amplifiers,
rail-to-rail output amplifiers, reference buffers for
external
voltage
reference,
shutdown
and
reset-management circuitry. The devices use an SPI
serial communication interface and operate with a
single supply voltage from 2.7V to 5.5V.
The DAC input coding of these devices is straight
binary. Equation 4-1 shows the DAC analog output
voltage calculation.
TABLE 4-1:
VOUT = ------------------------------ G
n
2
Where:
VREF
Dn
G
n
ANALOG OUTPUT
VOLTAGE (VOUT)
 VREF  Dn 
=
=
=
=
=
=
=
=
=
EXternal voltage reference
DAC input code
Gain Selection
2 for <GA> bit = 0
1 for <GA> bit = 1
DAC Resolution
8 for MCP4902
10 for MCP4912
12 for MCP4922
Gain
Selection
Device
1x
VREF/256
2x
(2* VREF)/256
MCP4912
1x
VREF/1024
(n = 10)
2x
(2* VREF)/1024
MCP4922
1x
VREF/4096
(n = 12)
2x
(2* VREF)/4096
where VREF is the external voltage reference.
4.1.1
DC Accuracy
INL ACCURACY
Integral Non-Linearity (INL) error is the maximum
deviation between an actual code transition point and
its corresponding ideal transition point, after offset and
gain errors have been removed. The two end points
(from 0x000 and 0xFFF) method is used for the calculation. Figure 4-1 shows the details.
A positive INL error represents transition(s) later than
ideal. A negative INL error represents transition(s) earlier than ideal.
INL < 0
111
110
The ideal output range of each device is:
(b) 0 V to 255/256 * 2 * VREF when gain setting = 2x.
Digital
Input
Code
• MCP4912 (n = 10)
100
011
(a) 0 V to 1023/1024 * VREF when gain setting = 1x.
010
(b) 0 V to 1023/1024 * 2 * VREF when gain setting = 2x.
001
• MCP4922 (n = 12)
INL < 0
(b) 0 V to 4095/4096 * 2 * VREF when gain setting = 2x.
See the output swing voltage specification
in Section 1.0 “Electrical Characteristics”.
1 LSb is the ideal voltage difference between two
successive codes. Table 4-1 illustrates the LSb
calculation of each device.
 2010 Microchip Technology Inc.
Ideal Transfer
Function
000
(a) 0 V to 4095/4096 * VREF when Gain setting = 1x.
Note:
Actual
Transfer
Function
101
• MCP4902 (n = 8)
(a) 0 V to 255/256 * VREF when gain setting = 1x.
LSb Size
MCP4902
(n = 8)
4.1
EQUATION 4-1:
LSb OF EACH DEVICE
DAC Output
FIGURE 4-1:
4.1.2
Example for INL Error.
DNL ACCURACY
A Differential Non-Linearity (DNL) error is the measure
of variations in code widths from the ideal code width.
A DNL error of zero indicates that every code is exactly
1 LSb wide.
DS22250A-page 19
MCP4902/4912/4922
4.2.2
111
110
Actual
transfer
function
101
100
Ideal transfer
function
011
010
Wide code, > 1 LSb
001
4.2.3
Narrow code, < 1 LSb
DAC Output
FIGURE 4-2:
Example for DNL Accuracy.
OFFSET ERROR
An offset error is the deviation from zero voltage output
when the digital input code is zero.
4.1.4
GAIN ERROR
A gain error is the deviation from the ideal output,
VREF– 1 LSb, excluding the effects of offset error.
4.2
4.2.1
Circuit Descriptions
OUTPUT AMPLIFIERS
The DAC’s outputs are buffered with a low-power,
precision CMOS amplifier. This amplifier provides low
offset voltage and low noise. The output stage enables
the device to operate with output voltages close to the
power supply rails. Refer to Section 1.0 “Electrical
Characteristics” for the analog output voltage range
and load conditions.
In addition to resistive load driving capability, the
amplifier will also drive high capacitive loads without
oscillation. The amplifier’s strong outputs allow VOUT to
be used as a programmable voltage reference in a
system.
Selecting a gain of 2 reduces the bandwidth of the
amplifier in Multiplying mode. Refer to Section 1.0
“Electrical Characteristics” for the Multiplying mode
bandwidth for given load conditions.
4.2.1.1
POWER-ON RESET CIRCUIT
The internal Power-on Reset (POR) circuit monitors the
power supply voltage (VDD) during the device
operation. The circuit also ensures that the DACs
power-up with high output impedance (<SHDN> = 0,
typically 500 k. The devices will continue to have a
high-impedance output until a valid write command is
performed to either of the DAC registers and the LDAC
pin meets the input low threshold.
If the power supply voltage is less than the POR
threshold (VPOR = 2.0V, typical), the DACs will be held
in their Reset state. The DACs will remain in that state
until VDD > VPOR and a subsequent write command is
received.
Figure 4-3 shows a typical power supply transient
pulse and the duration required to cause a reset to
occur, as well as the relationship between the duration
and trip voltage. A 0.1 µF decoupling capacitor,
mounted as close as possible to the VDD pin, can
provide additional transient immunity.
5V
Supply Voltages
000
4.1.3
The input buffer amplifiers for the MCP4902/4912/4922
devices provide low offset voltage and low noise. A
Configuration bit for each DAC allows the VREF input to
bypass the VREF input buffer amplifiers, achieving a
Buffered or Unbuffered mode. Buffered mode provides
a very high input impedance, with only minor limitations
on the input range and frequency response.
Unbuffered (<BUF> = 0) is the default configuration.
Unbuffered mode provides a wide input range (0V to
VDD), with a typical input impedance of 165 k with
7 pF.
VPOR
VDD - VPOR
Transient Duration
Time
10
Transient Duration (µs)
Digital
Input
Code
VOLTAGE REFERENCE
AMPLIFIERS
Programmable Gain Block
The rail-to-rail output amplifier has configurable gain,
allowing optimal full-scale outputs for different voltage
reference inputs. The output amplifier gain has two
selections, a gain of 1x (<GA> = 1) or a gain of 2x
(<GA> = 0).
=
6
4
Transients
above
the
2
Transients
0
FIGURE 4-3:
TA
8
1
below
the
2
3
4
VDD – VPOR (V)
5
Typical Transient Response.
The default value is a gain of 2 (<GA> = 0).
DS22250A-page 20
 2010 Microchip Technology Inc.
MCP4902/4912/4922
4.2.4
SHUTDOWN MODE
The user can shut down each DAC channel selectively
by using a software command or shut down all channels by using the SHDN pin. During Shutdown mode,
most of the internal circuits in the channel that was shut
down are turned off for power savings. The serial interface remains active, thus allowing a write command to
bring the device out of the Shutdown mode. There will
be no analog output at the channel that was shut down
and the VOUT pin is internally switched to a known
resistive load (500 k typical. Figure 4-4 shows the
analog output stage during the Shutdown mode.
The condition of the Power-on Reset circuit during the
shutdown is as follows:
a)
b)
Turned-off, if the shutdown occurred by the
SHDN pin;
On, if the shutdown occurred by the software.
VOUT
Op
Amp
Power-Down
Control Circuit
Resistive String DAC
FIGURE 4-4:
Mode.
Resistive
Load
500 k
Output Stage for Shutdown
The device will remain in Shutdown mode until the
SHDN pin is brought to high or a write command with
<SHDN> bit = 1 is latched into the device. When a DAC
is changed from Shutdown to Active mode, the output
settling time takes less than 10 µs, but more than the
standard active mode settling time (4.5 µs).
 2010 Microchip Technology Inc.
DS22250A-page 21
MCP4902/4912/4922
NOTES:
DS22250A-page 22
 2010 Microchip Technology Inc.
MCP4902/4912/4922
5.0
SERIAL INTERFACE
5.1
Overview
The MCP4902/4912/4922 devices are designed to
interface directly with the Serial Peripheral Interface
(SPI) port, which is available on many microcontrollers
and supports Mode 0,0 and Mode 1,1. Commands and
data are sent to the device via the SDI pin, with data
being clocked-in on the rising edge of SCK. The
communications are unidirectional, thus the data
cannot be read out of the MCP4902/4912/4922. The
CS pin must be held low for the duration of a write
command. The write command consists of 16 bits and
is used to configure the DAC’s control and data latches.
Register 5-1 to Register 5-3 detail the input register
that is used to configure and load the DACA and DACB
registers for each device. Figure 5-1 to Figure 5-3
show the write command for each device.
Refer to Figure 1-1 and SPI Timing Specifications
Table for detailed input and output timing specifications
for both Mode 0,0 and Mode 1,1 operation.
 2010 Microchip Technology Inc.
5.2
Write Command
The write command is initiated by driving the CS pin
low, followed by clocking the four Configuration bits and
the 12 data bits into the SDI pin on the rising edge of
SCK. The CS pin is then raised, causing the data to be
latched into the selected DAC’s input registers. The
MCP4902/4912/4922 utilizes a double-buffered latch
structure to allow both DACA’s and DACB’s outputs to
be synchronized with the LDAC pin, if desired. Upon
the LDAC pin achieving a low state, the values held in
the DAC’s input registers are transferred into the DAC’s
output registers. The outputs will transition to the value
and held in the DACX register.
All writes to the MCP4902/4912/4922 are 16-bit words.
Any clocks past the 16th clock will be ignored. The
Most Significant 4 bits are Configuration bits. The
remaining 12 bits are data bits. No data can be
transferred into the device with CS high. This transfer
will only occur if 16 clocks have been transferred into
the device. If the rising edge of CS occurs prior to that,
shifting of data into the input registers will be aborted.
DS22250A-page 23
MCP4902/4912/4922
REGISTER 5-1:
WRITE COMMAND REGISTER FOR MCP4922 (12-BIT DAC)
W-x
W-x
W-x
W-0
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
A/B
BUF
GA
SHDN
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
bit 15
bit 0
REGISTER 5-2:
WRITE COMMAND REGISTER FOR MCP4912 (10-BIT DAC)
W-x
W-x
W-x
W-0
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
A/B
BUF
GA
SHDN
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
x
bit 15
W-x
x
bit 0
REGISTER 5-3:
WRITE COMMAND REGISTER FOR MCP4902 (8-BIT DAC)
W-x
W-x
W-x
W-0
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
W-x
A/B
BUF
GA
SHDN
D7
D6
D5
D4
D3
D2
D1
D0
x
x
x
bit 15
W-x
x
bit 0
Where:
bit 15
bit 14
A/B: DACA or DACB Selection bit
1 = Write to DACB
0 = Write to DACA
BUF: VREF Input Buffer Control bit
Buffered
Unbuffered
1=
0=
bit 13
GA: Output Gain Selection bit
1 = 1x (VOUT = VREF * D/4096)
0 = 2x (VOUT = 2 * VREF * D/4096)
bit 12
SHDN: Output Shutdown Control bit
1 = Active mode operation. VOUT is available. 
0 = Shutdown the selected DAC channel. Analog output is not available at the channel that was shut down.
VOUT pin is connected to 500 ktypical)
bit 11-0
D11:D0: DAC Input Data bits. Bit x is ignored.
Legend
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
1 = bit is set
0 = bit is cleared
DS22250A-page 24
x = bit is unknown
 2010 Microchip Technology Inc.
MCP4902/4912/4922
CS
0
1
2
3
4
5
6
7
8
9
10 11
12
(Mode 1,1)
13 14 15
SCK
(Mode 0,0)
config bits
SDI
12 data bits
A/B BUF GA SHDN D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
LDAC
VOUT
FIGURE 5-1:
Write Command for MCP4922 (12-bit DAC).
CS
0
1
2
3
4
5
6
7
8
9
10 11
12
(Mode 1,1)
13 14 15
SCK
(Mode 0,0)
config bits
SDI
12 data bits
A/B BUF GA SHDN D9
D8 D7 D6 D5 D4 D3 D2 D1 D0
X
X
LDAC
VOUT
Note:
X = “don’t care” bits
FIGURE 5-2:
Write Command for MCP4912 (10-bit DAC).
CS
0
1
2
3
4
5
6
7
8
9
10 11
12
(Mode 1,1)
13 14 15
SCK
(Mode 0,0)
config bits
SDI
A/B BUF GA SHDN D7
12 data bits
D6 D5 D4 D3 D2 D1 D0
X
X
X
X
LDAC
VOUT
Note:
FIGURE 5-3:
X = “don’t care” bits
Write Command for MCP4902 (8-bit DAC).
 2010 Microchip Technology Inc.
DS22250A-page 25
MCP4902/4912/4922
NOTES:
DS22250A-page 26
 2010 Microchip Technology Inc.
MCP4902/4912/4922
TYPICAL APPLICATIONS
VDD
Applications generally suited for the devices are:
•
•
•
•
•
VDD
Set Point or Offset Trimming
Sensor Calibration
Digitally-Controlled Multiplier/Divider
Portable Instrumentation (Battery Powered)
Motor Control Feedback Loop
6.1
Digital Interface
The MCP4902/4912/4922 utilizes a 3-wire synchronous serial protocol to transfer the DAC’s setup and
output values from the digital source. The serial protocol can be interfaced to SPI or Microwire peripherals
that is common on many microcontroller units (MCUs),
including Microchip’s PIC® MCUs and dsPIC® DSCs.
In addition to the three serial connections (CS, SCK
and SDI), the LDAC signal synchronizes the two DAC
outputs. By bringing down the LDAC pin to “low”, all
DAC input codes and settings in the two DAC input
registers are latched into their DAC output registers at
the same time. Therefore, both DACA and DACB
outputs are updated at the same time. Figure 6-1
shows an example of the pin connections. Note that the
LDAC pin can be tied low (VSS) to reduce the required
connections from 4 to 3 I/O pins. In this case, the DAC
output can be immediately updated when a valid
16-clock transmission has been received and CS pin
has been raised.
6.2
Power Supply Considerations
The typical application will require a bypass capacitor
in order to filter high-frequency noise. The noise can be
induced onto the power supply’s traces from various
events such as digital switching or as a result of
changes on the DAC’s output. The bypass capacitor
helps to minimize the effect of these noise sources.
Figure 6-1 illustrates an appropriate bypass strategy. In
this example, two bypass capacitors are used in
parallel: (a) 0.1 µF (ceramic) and (b) 10 µF (tantalum).
These capacitors should be placed as close to the
device power pin (VDD) as possible (within 4 mm).
C2
C1
VREFB
VOUTB
CS1
SDI
VREFA
VOUTA
VREFB
VOUTB
SDI
C2
C1
VREFA
VOUTA
C1
VDD
AVSS
SDO
SCK
LDAC
PIC® Microcontroller
C1 = 10 µF
C2 = 0.1 µF
MCP49x2
The MCP4902/4912/4922 family of devices are general purpose DACs intended to be used in applications
where a precision with low-power and moderate
bandwidth is required.
MCP49x2
6.0
CS0
VSS
AVSS
FIGURE 6-1:
Diagram.
6.3
Typical Connection
Layout Considerations
Inductively-coupled AC transients and digital switching
noises can degrade the input and output signal
integrity, and potentially reduce the device performance. Careful board layout will minimize these effects
and increase the Signal-to-Noise Ratio (SNR). Bench
testing has shown that a multi-layer board utilizing a
low-inductance ground plane, isolated inputs and
isolated outputs with proper decoupling, is critical for
the best performance. Particularly harsh environments
may require shielding of critical signals.
Breadboards and wire-wrapped boards are not
recommended if low noise is desired.
The power source supplying these devices should be
as clean as possible. If the application circuit has
separate digital and analog power supplies, VDD and
VSS should reside on the analog plane.
 2010 Microchip Technology Inc.
DS22250A-page 27
MCP4902/4912/4922
6.4
Single-Supply Operation
6.4.1.1
If the application is calibrating the bias voltage of a
diode or transistor, a bias voltage range of 0.8V may be
desired with about 200 µV resolution per step. Two
common methods to achieve a 0.8V range is to either
reduce VREF to 0.82V or use a voltage divider on the
DAC’s output.
The MCP4902/4912/4922 family of devices are rail-torail voltage output DAC devices designed to operate
with a VDD range of 2.7V to 5.5V. Its output amplifier is
robust enough to drive small-signal loads directly.
Therefore, it does not require any external output buffer
for most applications.
6.4.1
Decreasing Output Step Size
Using a VREF is an option if the VREF is available with
the desired output voltage range. However,
occasionally, when using a low-voltage VREF, the noise
floor causes SNR error that is intolerable. Using a
voltage divider method is another option and provides
some advantages when VREF needs to be very low or
when the desired output voltage is not available. In this
case, a larger value VREF is used while two resistors
scale the output range down to the precise desired
level.
DC SET POINT OR CALIBRATION
A common application for the DAC devices is
digitally-controlled set points and/or calibration of
variable parameters, such as sensor offset or slope.
For example, the MCP4922 provides 4096 output
steps. If the external voltage reference (VREF) is
4.096V, the LSb size is 1 mV. If a smaller output step
size is desired, a lower external voltage reference is
needed.
Example 6-1 illustrates this concept. Note that the
bypass capacitor on the output of the voltage divider
plays a critical function in attenuating the output noise
of the DAC and the induced noise from the
environment.
EXAMPLE 6-1:
EXAMPLE CIRCUIT OF SET POINT OR THRESHOLD CALIBRATION
(a) Single Output DAC:
MCP4901
MCP4911
MCP4921
VDD
(b) Dual Output DAC:
MCP4902
MCP4912
MCP4922
VREF
VDD
DAC
VCC+
RSENSE
VOUT
R1
VTRIP
R2
0.1 uF
Comparator
VO
VCC–
SPI
3-wire
Dn
V OUT = V REF  G  -----N
2
 R2 
Vtrip = V OUT  --------------------
 R1 + R2
DS22250A-page 28
G = Gain selection (1x or 2x)
Dn = Digital value of DAC (0-255) for MCP4901/MCP4902
= Digital value of DAC (0-1023) for MCP4911/MCP4912
= Digital value of DAC (0-4095) for MCP4921/MCP4922
N = DAC Bit Resolution
 2010 Microchip Technology Inc.
MCP4902/4912/4922
6.4.1.2
Building a “Window” DAC
If the threshold is not near VREF or VSS, then creating
a “window” around the threshold has several
advantages. One simple method to create this
“window” is to use a voltage divider network with a
pull-up and pull-down resistor. Example 6-2 and
Example 6-4 illustrate this concept.
When calibrating a set point or threshold of a sensor,
typically only a small portion of the DAC output range is
utilized. If the LSb size is adequate enough to meet the
application’s accuracy needs, the unused range is
sacrificed without consequences. If greater accuracy is
needed, then the output range will need to be reduced
to increase the resolution around the desired threshold.
EXAMPLE 6-2:
SINGLE-SUPPLY “WINDOW” DAC
(a) Single Output DAC:
MCP4901
MCP4911
MCP4921
(b) Dual Output DAC:
MCP4902
MCP4912
MCP4922
VREF
VCC+
VCC+
Rsense
VDD
DAC
VOUT
R3
R1
Comparator
Vtrip
0.1 µF
R2
SPI
3
VCC-
VCC-
Dn
V OUT = VREF  G  -----N
2
G = Gain selection (1x or 2x)
Dn = Digital value of DAC (0-255) for MCP4901/MCP4902
= Digital value of DAC (0-1023) for MCP4911/MCP4912
= Digital value of DAC (0-4095) for MCP4921/MCP4922
N = DAC Bit Resolution
Thevenin
Equivalent
R 2 R3
R 23 = -----------------R2 + R 3
V 23
VOUT
R1
VO
 V CC+ R2  +  VCC- R3 
= ----------------------------------------------------R 2 + R3
V OUT R23 + V 23 R1
V trip = -------------------------------------------R 2 + R23
 2010 Microchip Technology Inc.
R23
V23
DS22250A-page 29
MCP4902/4912/4922
6.5
Bipolar Operation
Bipolar operation is achievable using the MCP4902/
4912/4922 family of devices by using an external
operational amplifier (op amp). This configuration is
desirable due to the wide variety and availability of op
amps. This allows a general purpose DAC, with its cost
and availability advantages, to meet almost any
desired output voltage range, power and noise
performance.
EXAMPLE 6-3:
Example 6-3 illustrates a simple bipolar voltage source
configuration. R1 and R2 allow the gain to be selected,
while R3 and R4 shift the DAC’s output to a selected
offset. Note that R4 can be tied to VREF instead of VSS,
if a higher offset is desired. Also note that a pull-up to
VREF could be used instead of R4, if a higher offset is
desired.
DIGITALLY-CONTROLLED BIPOLAR VOLTAGE SOURCE
2
VREF
(a) Single Output DAC:
MCP4901
MCP4911
MCP4921
VREF
VDD
(b) Dual Output DAC:
DAC
MCP4902
MCP4912
MCP4922
VOUT
R3
R4
SPI
VCC+
R1
VO
VIN+
0.1 µF
VCC–
3
Dn
VOUT = V REF  G  -----N
2
VIN+
V OUT R4
= -------------------R3 + R 4
R2
R2
VO = V IN+  1 + ------ – VDD  ------

 R 1
R1
6.5.1
G = Gain selection (1x or 2x)
Dn = Digital value of DAC (0-255) for MCP4901/MCP4902
= Digital value of DAC (0-1023) for MCP4911/MCP4912
= Digital value of DAC (0-4095) for MCP4921/MCP4922
N = DAC Bit Resolution
DESIGN EXAMPLE: DESIGN A BIPOLAR
DAC USING EXAMPLE 6-3 WITH 12-BIT
MCP4922 OR MCP4921
An output step magnitude of 1 mV with an output range
of ±2.05V is desired for a particular application.
The following steps show the details:
Step 1: Calculate the range: +2.05V – (-2.05V) = 4.1V.
Step 2: Calculate the resolution needed:
4.1V/1 mV = 4100
Since 212 = 4096, 12-bit resolution is
desired.
Step 3:The amplifier gain (R2/R1), multiplied by VREF,
must be equal to the desired minimum output
to achieve bipolar operation. Since any gain
can be realized by choosing resistor values
(R1+R2), the VREF source needs to be determined first. If a VREF of 4.1V is used, solve for
the gain by setting the DAC to 0, knowing that
the output needs to be -2.05V. The equation
can be simplified to:
DS22250A-page 30
–R2
– 2.05
– 2.05
--------- = ------------- = ------------R1
V REF
4.1
R2
1
------ = --R1
2
If R1 = 20 k and R2 = 10 k, the gain will be 0.5.
Step 4: Next, solve for R3 and R4 by setting the DAC to
4096, knowing that the output needs to be
+2.05V.
R4
2.05V + 0.5V REF
2
----------------------- = ----------------------------------------- = --1.5VREF
 R3 + R 4 
3
If R4 = 20 k, then R3 = 10 k
 2010 Microchip Technology Inc.
MCP4902/4912/4922
6.6
Selectable Gain and Offset Bipolar
Voltage Output Using a Dual DAC
This circuit is typically used in Multiplier mode and is
ideal for linearizing a sensor whose slope and offset
varies. Refer to Section 6.9 “Using Multiplier Mode”
for more information on Multiplier mode.
In some applications, precision digital control of the
output range is desirable. Example 6-4 illustrates how
to use the MCP4902/4912/4922 to achieve this in a
bipolar or single-supply application.
EXAMPLE 6-4:
The equation to design a bipolar “window” DAC would
be utilized if R3, R4 and R5 are populated.
BIPOLAR VOLTAGE SOURCE WITH SELECTABLE GAIN AND OFFSET
R2
VREFA VDD
VOUTA
DACA
Dual Output DAC:
MCP4902
MCP4912 VREFB
MCP4922
VCC+
R1
DACA (Gain Adjust)
VDD
VOUTB
DACB
VCC+
R5
R3
DACB (Offset Adjust)
SPI
VO
R4
3
0.1uF
VCC–
VCC–
DA
VOUTA =  V REFA G A  -----N
2
DB
V OUTB =  VREFB G B  -----N
2
GX = Gain selection (1x or 2x)
N = DAC Bit Resolution
DA, DB = Digital value of DAC (0-255) for MCP4902
VOUTB R 4 + VCC- R3
V IN+ = -----------------------------------------------R3 + R4
= Digital value of DAC (0-1023) for MCP4912
= Digital value of DAC (0-4095) for MCP4922
R2
R2
V O = V IN+  1 + ------ – V OUTA  ------
 R 1

R 1
Offset Adjust Gain Adjust
Bipolar “Window” DAC using R4 and R5
Thevenin
Equivalent
V CC+ R4 + V CC- R 5
V45 = -------------------------------------------R4 + R5
VOUTB R 45 + V45 R 3
V IN+ = ----------------------------------------------R3 + R 45
R4 R5
R 45 = -----------------R4 + R5
R2
R2
V O = VIN+  1 + ------ – V OUTA  ------

 R 1
R 1
Offset Adjust Gain Adjust
 2010 Microchip Technology Inc.
DS22250A-page 31
MCP4902/4912/4922
6.7
Designing a Double-Precision
DAC Using a Dual DAC
Example 6-5 illustrates how to design a single-supply
voltage output capable of up to 24-bit resolution from a
dual 12-bit DAC. This design is simply a voltage divider
with a buffered output.
As an example, if a application similar to the one
developed in Section 6.5.1 “Design Example: Design
a Bipolar DAC Using Example 6-3 with 12-bit
MCP4922 or MCP4921” required a resolution of 1 µV
instead of 1 mV and a range of 0V to 4.1V, then 12-bit
resolution would not be adequate.
EXAMPLE 6-5:
Step 1: Calculate the resolution needed:
4.1V/1 µV = 4.1x106. Since 222 = 4.2x106, 22bit resolution is desired. Since DNL = ±0.75
LSb, this design can be attempted with the
MCP4922.
Step 2: Since DACB’s VOUTB has a resolution of 1 mV,
its output only needs to be “pulled” 1/1000 to
meet the 1 µV target. Dividing VOUTA by 1000
would allow the application to compensate for
DACB’s DNL error.
Step 3: If R2 is 100, then R1 needs to be 100 k.
Step 4:The resulting transfer function is not perfectly
linear, as shown in the equation of
Example 6-5.
SIMPLE, DOUBLE-PRECISION DAC WITH MCP4922
VDD
VREF
MCP4922
VDD
MCP4922
VCC+
VOUTA
DACA (Fine Adjust)
VO
R1
R1 >> R2
VOUTB
R2
0.1 µF
VCC–
DACB (Course Adjust)
SPI
3
DA
V OUTA = VREFA GA ------12
2
G = Gain selection (1x or 2x)
D = Digital value of DAC (0- 4096)
VOUTA R 2 + VOUTB R 1
V O = ----------------------------------------------------R 1 + R2
DB
V OUTB = VREFB GB ------12
2
DS22250A-page 32
 2010 Microchip Technology Inc.
MCP4902/4912/4922
6.8
Building Programmable Current
Source
When working with very small sensor voltages, plan on
eliminating the amplifier’s offset error by storing the
DAC’s setting under known sensor conditions.
Example 6-6 shows an example for building a
programmable current source using a voltage follower.
The current sensor (sensor resistor) is used to convert
the DAC voltage output into a digitally-selectable
current source.
Adding the resistor network from Example 6-2 would
be advantageous in this application. The smaller Rsense
is, the less power dissipated across it. However, this
also reduces the resolution that the current can be
controlled with. The voltage divider, or “window”, DAC
configuration would allow the range to be reduced, thus
increasing resolution around the range of interest.
EXAMPLE 6-6:
DIGITALLY-CONTROLLED CURRENT SOURCE
VDD or VREF
(a) Single Output DAC:
VREF
MCP4901
MCP4911
MCP4921
VDD
DAC
VOUT
(b) Dual Output DAC:
MCP4902
MCP4912
MCP4922
Load
VCC+
IL
Ib
SPI
3-wire
VCC–
RSENSE
IL
Ib = ---
VOUT

IL = ---------------  -----------R sense  + 1
where Common-Emitter Current Gain
Dn
VOUT = V REF  G  -----N
2
 2010 Microchip Technology Inc.
G = Gain select (1x or 2x)
Dn = Digital value of DAC (0-255) for MCP4901/MCP4902
= Digital value of DAC (0-1023) for MCP4911/MCP4912
= Digital value of DAC (0-4095) for MCP4921/MCP4922
N = DAC Bit Resolution
DS22250A-page 33
MCP4902/4912/4922
6.9
Using Multiplier Mode
If the gain selection bit is configured for 1x mode
(<GA> = 1), the resulting input signal will be attenuated
by D/2n. With the 12-bit DAC (MCP4921 or MCP4922),
if the gain is configured for 2x mode (<GA> = 0), the
codes less than 2048 attenuate the signal, while the
codes greater than 2048 gain the signal.
The MCP4902/4912/4922 family of devices use external reference, and these devices are ideally suited for
use as a multiplier/divider in a signal chain. The
common applications are: (a) Precision programmable
gain/attenuator amplifiers and (b) Motor control
feedback loop. The wide input range (0V – VDD) is in
Unbuffered mode and near rail-to-rail range in Buffered
mode: its bandwidth (> 400 kHz), selectable 1x/2x gain
and low power consumption give maximum flexibility to
meet the application’s needs.
A DAC provides significantly more gain/attenuation
resolution when compared to typical Programmable
Gain Amplifiers. Adding an op amp to buffer the output,
as illustrated in Examples 6-2 to 6-6, extends the
output range and power to meet the precise needs of
the application.
To configure the MCP4902/4912/4922 family of
devices for multiple applications, connect the input signal to VREF and serially configure the DAC’s input buffer, gain and output value. The DAC’s output can utilize
any of Examples 6-1 to 6-6, depending on the application requirements. Example 6-7 is an illustration of how
the DAC can operate in a motor control feedback loop.
EXAMPLE 6-7:
MULTIPLIER MODE USING VREF INPUT
VRPM_SET
VRPM
(a) Single Output DAC:
MCP4901
MCP4911
MCP4921
(b) Dual Output DAC:
MCP4902
MCP4912
MCP4922
VDD
DAC
VREF
ZFB
VOUT
SPI
3
VCC+
+
–
VCCRsense
Dn
V OUT = V REF  G  -----N
2
DS22250A-page 34
 2010 Microchip Technology Inc.
MCP4902/4912/4922
7.0
DEVELOPMENT SUPPORT
7.1
Evaluation and Demonstration
Boards
The Mixed Signal PICtailTM Demo Board supports the
MCP4902/4912/4922 family of devices. Please refer to
www.microchip.com for further information on this
products capabilities and availability.
 2010 Microchip Technology Inc.
DS22250A-page 35
MCP4902/4912/4922
NOTES:
DS22250A-page 36
 2010 Microchip Technology Inc.
MCP4902/4912/4922
8.0
PACKAGING INFORMATION
8.1
Package Marking Information
14-Lead PDIP (300 mil)
Example:
XXXXXXXXXXXXXX
XXXXXXXXXXXXXX
YYWWNNN
14-Lead SOIC (150 mil)
MCP4922
E/P e3
1011256
Example:
XXXXXXXXXX
XXXXXXXXXX
YYWWNNN
Example:
14-Lead TSSOP
XXXXXX
YYWW
4922E/ST
1011
NNN
256
Legend: XX...X
Y
YY
WW
NNN
e3
*
Note:
MCP4922
E/SL e3
1011256
Customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available characters
for customer-specific information.
 2010 Microchip Technology Inc.
DS22250A-page 37
MCP4902/4912/4922
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DS22250A-page 39
MCP4902/4912/4922
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MCP4902/4912/4922
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 2010 Microchip Technology Inc.
DS22250A-page 41
MCP4902/4912/4922
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS22250A-page 42
 2010 Microchip Technology Inc.
MCP4902/4912/4922
APPENDIX A:
REVISION HISTORY
Revision A (April 2010)
• Original Release of this Document.
 2010 Microchip Technology Inc.
DS22250A-page 43
MCP4902/4912/4922
NOTES:
DS22250A-page 44
 2010 Microchip Technology Inc.
MCP4902/4912/4922
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
X
/XX
Device
Temperature
Range
Package
Device:
Examples:
MCP4902: Dual 8-Bit Voltage Output DAC
MCP4902T: Dual 8-Bit Voltage Output DAC
(Tape and Reel)
MCP4912: Dual 10-Bit Voltage Output DAC
MCP4912T: Dual 10-Bit Voltage Output DAC
(Tape and Reel)
MCP4922: Dual 12-Bit Voltage Output DAC
MCP4922T: Dual 12-Bit Voltage Output DAC
(Tape and Reel)
Temperature
Range:
E
= -40C to +125C
Package:
P
SL
ST
=
=
=
(Extended)
14-Lead Plastic Dual In-Line (PDIP)
14-Lead Plastic Small Outline - Narrow (SOIC)
14-Lead Plastic Think Shrink Small Outline
(TSSOP)
 2010 Microchip Technology Inc.
a)
MCP4902-E/P:
b)
MCP4902-E/SL:
c)
MCP4902T-E/SL:
d)
MCP4902-E/ST:
e)
MCP4902T-E/ST:
f)
MCP4912-E/P:
g)
MCP4912-E/SL:
h)
MCP4912T-E/SL:
i)
MCP4912-E/ST:
j)
MCP4912T-E/ST:
k)
MCP4922-E/P:
l)
MCP4922-E/SL:
m)
MCP4922T-E/SL:
n)
MCP4922-E/ST:
o)
MCP4922T-E/ST:
Extended temperature,
PDIP package.
Extended temperature,
SOIC package.
Extended temperature,
SOIC package, Tape
and Reel
Extended temperature,
TSSOP package.
Extended temperature,
TSSOP package, Tape
and Reel
Extended temperature,
PDIP package.
Extended temperature,
SOIC package.
Extended temperature,
SOIC package, Tape
and Reel
Extended temperature,
TSSOP package.
Extended temperature,
TSSOP package, Tape
and Reel
Extended temperature,
PDIP package.
Extended temperature,
SOIC package.
Extended temperature,
SOIC package, Tape
and Reel
Extended temperature,
TSSOP package.
Extended temperature,
TSSOP package, Tape
and Reel
DS22250A-page 45
MCP4902/4912/4922
NOTES:
DS22250A-page 46
 2010 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,
PIC32 logo, rfPIC and UNI/O are registered trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MXDEV, MXLAB, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip
Technology Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, Mindi, MiWi, MPASM, MPLAB Certified
logo, MPLIB, MPLINK, mTouch, Octopus, Omniscient Code
Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
PICtail, REAL ICE, rfLAB, Select Mode, Total Endurance,
TSHARC, UniWinDriver, WiperLock and ZENA are
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2010, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 978-1-60932-129-1
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
 2010 Microchip Technology Inc.
DS22250A-page 47
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://support.microchip.com
Web Address:
www.microchip.com
Asia Pacific Office
Suites 3707-14, 37th Floor
Tower 6, The Gateway
Harbour City, Kowloon
Hong Kong
Tel: 852-2401-1200
Fax: 852-2401-3431
India - Bangalore
Tel: 91-80-3090-4444
Fax: 91-80-3090-4123
India - New Delhi
Tel: 91-11-4160-8631
Fax: 91-11-4160-8632
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
India - Pune
Tel: 91-20-2566-1512
Fax: 91-20-2566-1513
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Japan - Yokohama
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Atlanta
Duluth, GA
Tel: 678-957-9614
Fax: 678-957-1455
Boston
Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Cleveland
Independence, OH
Tel: 216-447-0464
Fax: 216-447-0643
Dallas
Addison, TX
Tel: 972-818-7423
Fax: 972-818-2924
Detroit
Farmington Hills, MI
Tel: 248-538-2250
Fax: 248-538-2260
Kokomo
Kokomo, IN
Tel: 765-864-8360
Fax: 765-864-8387
Los Angeles
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
Santa Clara
Santa Clara, CA
Tel: 408-961-6444
Fax: 408-961-6445
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
China - Beijing
Tel: 86-10-8528-2100
Fax: 86-10-8528-2104
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
China - Chongqing
Tel: 86-23-8980-9588
Fax: 86-23-8980-9500
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Taiwan - Hsin Chu
Tel: 886-3-6578-300
Fax: 886-3-6578-370
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
China - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
01/05/10
DS22250A-page 48
 2010 Microchip Technology Inc.
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