IC ICM7363Q Quad 12/10/8-bit voltage-output dac Datasheet

ICM7363/7343/7323
ICmic
QUAD 12/10/8-BIT VOLTAGE-OUTPUT DACS
IC MICROSYSTEMS
FEATURES
•
12/10/8-Bit Monotonic Quad DACs in 16 lead
QSOP Package
•
Wide Output Voltage Swing
•
150 µA per DAC at 5V Supply
•
100 µA per DAC at 3V Supply
•
On Board Reference
•
Three-wire SPI Interface
•
Serial Data Out for Daisy-Chaining
•
8µs Full-Scale Settling Time
APPLICATIONS
Battery-Powered Applications
Industrial Process Control
Digital Gain and Offset Adjustment
respectively, with guaranteed monotonic behavior. They
include a 1.25V reference for ease of use and flexibility.
The reference output is available on a separate pin and
can be used to drive the reference input of each DAC.
Alternately, each DAC can be driven by an external
reference. There is a wide operating supply range of 2.7V
to 5.5V.
The input interface is an easy to use three-wire SPI/QSPI
compatible interface. Each DAC can be individually
controlled and has a double buffered digital input. There is
a serial data output to allow for daisy-chaining
applications.
OVERVIEW
The ICM7363, ICM7343 and ICM7323 are Quad 12-Bit,
10-Bit and 8-Bit wide output voltage swing DACs
BLOCK DIAGRAM
REFD
REFOUT
SDI
REFC
REFB
VDD
REFA
ICM 7363/7343/7323
Reference
Input and
DAC Latch
12/10/8 -Bit
DAC A
x2
VOUT A
Input and
DAC Latch
12/10/8 -Bit
DAC B
x2
VOUT B
Input and
DAC Latch
12/10/8 -Bit
DAC C
x2
VOUT C
Input and
DAC Latch
12/10/8 -Bit
DAC D
x2
VOUT D
Input Control Logic, Registers and Latches
SDO
Power-OnReset
SCK
Rev. A8
CS
CLR
GND
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ICM7363/7343/7323
ICmic
QUAD 12/10/8-BIT VOLTAGE-OUTPUT DACS
IC MICROSYSTEMS
PACKAGE
16-Pin QSOP
VDD 1
16 GND
VOUTA 2
15 VOUTD
REFA 3
14 REFD
VOUTB 4
13 VOUTC
REFB 5
12 REFC
REFOUT 6
11 CS
7
10 SDO
SDI 8
9 SCK
CLR
PIN DESCRIPTION
Pin No
Symbol
Description
1
VDD
Supply Voltage
2
VOUT A
DAC A Output
3
REF A
DAC A Reference Input
4
VOUT B
DAC B Output
5
REF B
DAC B Reference Input
6
REFOUT
Reference Output (1.25V)
7
CLR
Clear Input (TTL or CMOS)
8
SDI
Serial Data Input (TTL or CMOS)
9
SCK
Serial Clock Input (TTL or CMOS)
10
SDO
Serial Data Output
11
CS
Chip Select (TTL or CMOS)
12
REF C
DAC C Reference Input
13
VOUT C
DAC C Output
14
REF D
DAC D Reference Input
15
VOUT D
DAC D Output
16
GND
Ground
ABSOLUTE MAXIMUM RATING
Symbol
VDD
Parameter
Value
Unit
Supply Voltage
-0.3 to 7.0
V
IIN
Input Current
+/- 25.0
mA
VIN_
Digital Input Voltage (SCK, SDI, CS, CLR)
-0.3 to 7.0
V
Reference Input Voltage
-0.3 to 7.0
V
-65 to +150
o
VIN_REF
TSTG
Rev. A8
Storage Temperature
C
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ICM7363/7343/7323
ICmic
QUAD 12/10/8-BIT VOLTAGE-OUTPUT DACS
IC MICROSYSTEMS
TSOL
o
300
Soldering Temperature
C
Note: Stress greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.
ORDERING INFORMATION
Part
ICM7363
ICM7343
ICM7323
Temperature Range
Package
-40 oC to 85 oC
-40 oC to 85 oC
-40 oC to 85 oC
16-Pin QSOP
16-Pin QSOP
16-Pin QSOP
DC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V to 5.5V, VREF IN = 1.25V ; VOUT unloaded; all specifications TMIN to TMAX unless otherwise noted)
Symbol
Parameter
DC PERFORMANCE
ICM7363
N
Resolution
DNL
Differential Nonlinearity
INL
Integral Nonlinearity
ICM7343
N
Resolution
DNL
Differential Nonlinearity
INL
Integral Nonlinearity
ICM7323
N
Resolution
DNL
Differential Nonlinearity
INL
Integral Nonlinearity
GE
Gain Error
OE
Offset Error
POWER REQUIREMENTS
VDD
Supply Voltage
IDD
Supply Current
Symbol
Parameter
OUTPUT CHARACTERISTICS
Output Voltage Range
VOSC
Short Circuit Current
ROUT
Amp Output Impedance
Output Line Regulation
LOGIC INPUTS
VIH
Digital Input High
VIL
Digital Input Low
Digital Input Leakage
REFERENCE
RIN
Reference Input Resistance
Reference Input Range
VREFOUT
Reference Output
Reference Output Line
Regulation
Rev. A8
Test Conditions
Min
Typ
Max
12
(Notes 1 & 3)
(Notes 1 & 3)
0.4
4.0
+1.0
+12.0
Bits
LSB
LSB
0.1
1.0
+1.0
+3.0
Bits
LSB
LSB
0.05
0.25
+1.0
+0.75
Bits
LSB
LSB
+0.5
+25
% of FS
mV
5.5
2.5
V
mA
10
(Notes 1 & 3)
(Notes 1 & 3)
8
(Notes 1 & 3)
(Notes 1 & 3)
2.7
(Note 4)
Test Conditions
(Note 3)
1.2
Min
60
1.0
100
0.4
At Mid-scale
At Zero-scale
Vdd=2.7 to 5.5 V
(Note 2)
(Note 2)
(Note 2)
Vdd=2.7 to 5.5 V
Typ
0
Max
41
1.25
0.8
Unit
VDD
150
5.0
200
3.0
V
mA
Ω
Ω
mV/V
0.8
5
V
V
µΑ
65
VDD -1.5
1.3
4.0
kΩ
V
V
mV/V
2.4
25
0.5
1.2
Unit
ICmic reserves the right to change the specifications without prior notice.
3
ICM7363/7343/7323
ICmic
QUAD 12/10/8-BIT VOLTAGE-OUTPUT DACS
IC MICROSYSTEMS
AC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V to 5.5V, VREF IN = 1.25V ; VOUT unloaded; all specifications TMIN to TMAX unless otherwise noted)
Symbol
SR
Parameter
Test Conditions
Min
Typ
Slew Rate
Settling Time
Full-scale settling
Mid-scale Transition Glitch
Energy
Note 1:
Note 2:
Note 3:
Note 4:
Max
Unit
2
V/µs
8
µs
40
nV-S
Linearity is defined from code 64 to 4095 (ICM7363)
Linearity is defined from code 16 to 1023 (ICM7343)
Linearity is defined from code 4 to 255 (ICM7323)
Guaranteed by design; not tested in production
See Applications Information
All digital inputs are either at GND or Vdd
TIMING CHARACTERISTICS
(VDD = 2.7V to 5.5V; all specifications TMIN to TMAX unless otherwise noted)
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
t1
t2
t3
SCK Cycle Time
Data Setup Time
Data Hold Time
(Note 2)
(Note 2)
(Note 2)
30
10
10
ns
ns
ns
t4
SCK Falling edge to CS
Rising Edge
(Note 2)
0
ns
t5
CS Falling Edge to SCK
Rising Edge
15
ns
t6
CS Pulse Width
20
ns
(Note 2)
(Note 2)
(Note 2)
t7
t8
Rev. A8
CLR Pulse Width
SDO Delay
20
(Note 2)
ICmic reserves the right to change the specifications without prior notice.
100
ns
ns
4
ICM7363/7343/7323
ICmic
QUAD 12/10/8-BIT VOLTAGE-OUTPUT DACS
IC MICROSYSTEMS
t1
SCK
t3
t2
SDI
C3
C2
LSB
t5
Input Word for DAC N
t4
CS
t6
t8
SDO
C3
C2
Input Word for DAC N
Figure 1: Serial Interface Timing Diagram
CONTENTS OF INPUT SHIFT REGISTER
ICM7363 (12-Bit DAC)
MSB
C3
C2
C1
C0
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
LSB
D0
D0
X
LSB
X
X
X
LSB
X
Figure 2: Contents of ICM7363 Input Shift Register
ICM7343 (10-Bit DAC)
MSB
C3
C2
C1
C0
D9
D8
D7
D6
D5
D4
D3
D2
D1
Figure 3: Contents of ICM7343 Input Shift Register
ICM7323 (8-Bit DAC)
MSB
C3
C2
C1
C0
D7
D6
D5
D4
D3
D2
D1
D0
X
Figure 4: Contents of ICM7323 Input Shift Register
Rev. A8
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ICM7363/7343/7323
ICmic
QUAD 12/10/8-BIT VOLTAGE-OUTPUT DACS
IC MICROSYSTEMS
C3
C2
C1
C0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
DATA
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
X
DAC
FUNCTION
A
A
A
B
B
B
C
C
C
D
D
D
A-D
A-D
A-D
X
Load Input Latch
Update DAC
Load Input Latch and Update DAC
Load Input Latch
Update DAC
Load Input Latch and Update DAC
Load Input Latch
Update DAC
Load Input Latch and Update DAC
Load Input Latch
Update DAC
Load Input Latch and Update DAC
Load Input Latch
Update DAC
Load Input Latch and Update DAC
No Operation
Table 1: Serial Interface Control Command
Rev. A8
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ICM7363/7343/7323
ICmic
QUAD 12/10/8-BIT VOLTAGE-OUTPUT DACS
IC MICROSYSTEMS
DETAILED DESCRIPTION
The ICM7363 is a 12-bit quad voltage output DAC. The
ICM7343 is the 10-bit version of this family and the
ICM7323 is the 8-bit version.
This family of DACs employs a resistor string architecture
guaranteeing monotonic behavior. There is a 1.25V
onboard reference and a wide operating supply range of
2.7V to 5.5V.
Reference Input and Output
Each DAC has its own reference input pin which can be
driven from ground to VDD -1.5V. The input resistance on
each of these pins is typically 41 kΩ. There is a gain of two
in the output amplifiers which means they swing from
ground at code 0 to 2 x VREF IN at full-scale :
Vout = 2 x (VREF IN xD)/2n
Where D=digital input (decimal) and n= number of bits, i.e.
12 for ICM7363, 10 for ICM7343 and 8 for ICM7323.
be low before the CS pin is pulled back low. As the CS pin
is pulled high the shift register contents are transferred to
a bank of 16 latches. The 4 bit control word (C3~C0) is
then decoded and the appropriate DAC is updated or
loaded depending on the control word (see Table 1).
Each DAC has a double-buffered input with an input latch
and a DAC latch. The DAC output will swing to its new
value when data is loaded into the DAC latch. For each
DAC, the user has three options: loading only the input
latch, updating the DAC with data previously loaded into
the input latch or loading the input latch and updating the
DAC at the same time with a new code. The user also has
the ability to perform this operation simultaneously for all
DACs as shown in Table 1.
Power-On Reset
There is a power-on reset on board that will clear the
contents of all the latches to all 0s on power-up and the
DAC voltage outputs will go to ground. The CLR pin will
also perform this same operation asynchronously when it
is pulled low.
There is also an onboard band-gap reference on all these
parts. This reference output is nominally 1.25V and is
brought out to a separate pin, REFOUT and can be used
to drive the reference input of the DACs. The outputs will
nominally swing from 0 to 2.5V when using this reference.
Output Amplifier
Each DAC has its own output amplifier with a wide output
voltage swing. The actual swing of the output amplifier will
be limited by offset error and gain error. See the
Applications Information Section for a more detailed
discussion.
The amplifiers are configured in a gain of 2 with internal
gain resistors of about 50 kΩ. The output swing will be
from 0V to 2 x VREF IN at full-scale.
The output amplifier can drive a load of 2.0 kΩ to VDD or
GND in parallel with a 500 pF load capacitance.
The output amplifier has a full-scale typical settling time of
8 µs and it dissipates about 150 µA with a 5V supply
voltage.
Serial Interface and Input Logic
This quad DAC family uses a standard 3-wire connection
compatible with SPI/QSPI interfaces. There is also a serial
data output pin that allows daisy-chaining. Data is loaded
in 16-bit words which consist of 4 address and control bits
(MSBs) followed by 12 bits of data (see table 1). The
ICM7343 has the last two LSBs as don’t cares and the
ICM7323 has the last 4 LSBs as don’t cares. Each DAC is
double buffered with an input latch and a DAC latch.
All the digital inputs are CMOS/TTL compatible. The
current dissipation of the device however, will be higher
when the inputs are driven at TTL levels.
The output of the 16-bit input shift register is available at
the SDO pin. Data is clocked in on the rising edge of SCK
which has a Schmitt trigger internally to allow for noise
immunity on the SCK pin. This specially eases the use for
opto-coupled interfaces.
The CS pin must be low when data is being clocked into
the part. After the 16th clock pulse the CS pin must be
pulled high (level-triggered) for the data to be transferred
to an input bank of latches. The CS pin also disables the
SCK pin internally when pulled high and the SCK pin must
Rev. A8
ICmic reserves the right to change the specifications without prior notice.
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ICM7363/7343/7323
ICmic
QUAD 12/10/8-BIT VOLTAGE-OUTPUT DACS
IC MICROSYSTEMS
ground. This is why the linearity is specified for a starting
code greater than zero.
APPLICATIONS INFORMATION
Power Supply Bypassing and Layout Considerations
As in any precision circuit, careful consideration has to be
given to layout of the supply and ground. The return path
from the GND to the supply ground should be short with
low impedance. Using a ground plane would be ideal. The
supply should have some bypassing on it. A 10 µF
tantalum capacitor in parallel with a 0.1 µF ceramic with a
low ESR can be used. Ideally these would be placed as
close as possible to the device. Avoid crossing digital and
analog signals, specially the reference, or running them
close to each other.
Output Swing Limitations
The ideal rail-to-rail DAC would swing from GND to VDD
however, offset and gain error limit this ability. Figure 5
illustrates how a negative offset error will affect the output.
The output will limit close to ground since this is single
supply part, resulting in a deadband area. As a larger input
is loaded into the DAC the output will eventually rise above
Figure 6 illustrates how a gain error or positive offset error
will affect the output when it is close to VDD. A positive gain
error or positive offset will cause the output to be limited to
the positive supply voltage resulting in a deadband of
codes close to full-scale. This can be avoided by using a
reference voltage slightly less then 0.5 x VDD ensuring that
the full-scale of the DAC is always less than VDD.
DEADBAND
NEGATIVE
OFFSET
Figure 5: Effect of Negative Offset
OFFSET AND
GAIN ERROR
VDD
DEADBAND
POSITIVE
OFFSET
Figure 6: Effect of Gain Error and Positive Offset
Rev. A8
ICmic reserves the right to change the specifications without prior notice.
8
ICM7363/7343/7323
ICmic
QUAD 12/10/8-BIT VOLTAGE-OUTPUT DACS
IC MICROSYSTEMS
PACKAGE INFORMATION
Rev. A8
ICmic reserves the right to change the specifications without prior notice.
9
ICM7363/7343/7323
ICmic
QUAD 12/10/8-BIT VOLTAGE-OUTPUT DACS
IC MICROSYSTEMS
ORDERING INFORMATION
ICM73X3 P G
Device
6 - ICM7363
4 - ICM7343
2 - ICM7323
Rev. A8
G = RoHS Compliant Lead-Free package.
Blank = Standard package. Non lead-free.
Package
Q = 16-Lead QSOP
ICmic reserves the right to change the specifications without prior notice.
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