IC ICM7600TG 12/10/8-bit low power voltage output quad dacs with parallel interface Datasheet

ICM7620/7610/7600
12/10/8-Bit Low Power Voltage Output
Quad DACs With Parallel Interface
ICmic
IC MICROSYSTEMS
FEATURES
•
12/10/8-Bit Quad DAC s
•
Ultra-Low Power Consumption
•
Guaranteed Monotonic
•
Wide Voltage Swing Output Buffer
•
Parallel Interface with Double Buffered Inputs
•
Shutdown Capability
APPLICATION
•
Battery-Powered Applications
•
Industrial Process Control
•
Digital Gain and Offset Adjustment
The ICM7620, ICM7610 and ICM7600 are 12-Bit, 10-Bit
and 8-Bit Voltage Output, Low Power, Quad DACs
respectively, with guaranteed monotonic behavior. These
DACs are available in 20 and 24 Lead TSSOP packages.
The input interface for the devices is 12 (ICM7620), 10
(ICM7610) and 8 (ICM7600) bit parallel interface. They
operate from a single supply which can range from 2.7V to
5.5V.
These DACs also offer a shutdown feature. When active,
this will shutdown all DACs and would disconnect the REF
input from the DACs internally. The supply current is
reduced to below 10 µA in shutdown mode.
OVERVIEW
BLOCK DIAGRAM
REF
ICM7620/7610/7600
x2
VOA
INPUT LATCH A
DAC A
LATCH
DAC A
x2
VOB
INPUT LATCH B
DAC B
LATCH
DAC B
x2
INPUT
DATA
INPUT LATCH C
DAC C
LATCH
DAC C
x2
INPUT LATCH D
DAC D
LATCH
DAC D
INPUT
CONTROL
LOGIC
POWER DOWN CONTROL
WR
Rev. A7
A1, A0
LDAC
VOC
SHDN
ICmic reserves the right to change specifications without prior notice
VOD
ICM7620/7610/7600
PACKAGES (20 LEAD – ICM7600, 24 LEAD TSSOP – ICM7610, ICM7620)
VOB
1
20 VOC
VOB
1
24 VOC
VOA
2
19 VOD
VOA
2
23 VOD
V DD
3
18 GND
V DD
3
22 GND
REF
4
17 A0
REF
4
21 A0
16 A1
SHDN
5
WR
6
19 LDAC
ICM7600
SHDN
5
WR
6
15 LDAC
D7
7
14 D0
D9
7
18 NC
D6
8
13 D1
D8
8
17 NC
D5
9
12 D2
D7
9
16 D0
D4 10
11 D3
D6 10
15 D1
11
14 D2
D5
D4 12
VOB
1
24 VOC
VOA
2
23 VOD
V DD
3
22 GND
REF
4
21 A0
SHDN
5
WR
D11
6
7
19 LDAC
18 D0
D10
8
17
D1
D9
9
16
D2
D8
10
15
D3
D7
11
14 D4
D6
2
Rev. A7
12
ICM7620
20 A1
13
D5
ICmic reserves the right to change specifications without prior notice
ICM7610
20 A1
13 D3
ICM7620/7610/7600
PIN DESCRIPTION (ICM7600)
Pin
Name
I/O
Description
1
VOB
O
DAC B Output Voltage
2
VOA
O
DAC A Output Voltage
3
VDD
I
Supply Voltage
4
REF
I
Reference Voltage Input to All DAC
5
SHDN
I
Shutdown (Active high)
6
WR
D7-D0
I
Write Input (active low). Used to load input into input latch.
7-14
I
Data Inputs
I
Load DAC Input (active low).
16
LDAC
A1
I
DAC Address Select Bit (MSB)
17
A0
I
DAC Address Select Bit (LSB)
18
GND
I
Ground
19
VOD
O
DAC D Output Voltage
20
VOC
O
DAC C Output Voltage
15
PIN DESCRIPTION (ICM7610)
Pin
Name
1
VOB
O
DAC B Output Voltage
2
VOA
O
DAC A Output Voltage
3
VDD
I
Supply Voltage
4
REF
I
Reference Voltage Input to All DAC
5
SHDN
I
Shutdown (Active high)
Write Input (active low). Used to load input into input latch.
17-18
WR
NC
I
7-16
D11-D0
I
Data Inputs
LDAC
A1
I
Load DAC Input (active low).
20
I
DAC Address Select Bit (MSB)
21
A0
I
DAC Address Select Bit (LSB)
22
GND
I
Ground
23
VOD
O
DAC D Output Voltage
24
VOC
O
DAC C Output Voltage
6
19
Rev. A7
I/O
Description
No connection
ICmic reserves the right to change specifications without prior notice
3
ICM7620/7610/7600
PIN DESCRIPTION (ICM7620)
Pin
Name
I/O
Description
1
VOB
O
DAC B Output Voltage
2
VOA
O
DAC A Output Voltage
3
VDD
I
Supply Voltage
4
REF
I
Reference Voltage Input to All DAC
5
SHDN
I
Shutdown (Active high)
6
WR
D11-D0
I
Write Input (active low). Used to load input into input latch.
I
Data Inputs
I
Load DAC Input (active low).
20
LDAC
A1
I
DAC Address Select Bit (MSB)
21
A0
I
DAC Address Select Bit (LSB)
22
GND
I
Ground
23
VOD
O
DAC D Output Voltage
24
VOC
O
DAC C Output Voltage
7-18
19
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VDD
Supply Voltage
-0.3 to 7.0
V
IIN
Input Current
VIN_
Digital Input Voltage (D0~D11, A1, A0 , WR , LDAC )
+/- 25.0
mA
-0.3 to 7.0
V
VIN_REF
Reference Input Voltage
-0.3 to 7.0
V
TSTG
Storage Temperature
-65 to +150
oC
TSOL
Soldering Temperature
300
oC
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
4
Operating Temperature Range
Package
ICM7620
-40 oC to 85 oC
24-Lead TSSOP
ICM7610
-40 oC
to
85 oC
24-Lead TSSOP
ICM7600
-40 oC
to
85 oC
20-Lead TSSOP
Rev. A7
ICmic reserves the right to change specifications without prior notice
ICM7620/7610/7600
DC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V to 5.5V, VOUT unloaded; all specifications TMIN to TMAX unless otherwise noted)
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
DC PERFORMANCE
ICM7620
N
Resolution
12
Bits
DNL
Differential Nonlinearity
(Notes 1 & 3)
0.4
+1.0
LSB
INL
Integral Nonlinearity
(Notes 1 & 3)
4.0
+12.0
LSB
ICM7610
N
Resolution
10
Bits
DNL
Differential Nonlinearity
(Notes 1 & 3)
0.1
+1.0
LSB
INL
Integral Nonlinearity
(Notes 1 & 3)
1.0
+3.0
LSB
ICM7600
N
Resolution
8
Bits
DNL
Differential Nonlinearity
(Notes 1 & 3)
0.05
+1.0
LSB
INL
Integral Nonlinearity
(Notes 1 & 3)
0.25
+0.75
LSB
STATIC ACCURACY
GE
Gain Error
+1.0
% of FS
OE
Offset Error
+35
mV
5
5.5
V
POWER REQUIREMENTS
VDD
Supply Voltage
IDD
2.7
Supply Current
Full Scale at VDD=5..5
300
700
µA
Supply Current
Full Scale at VDD=3.6
200
550
µA
Supply Current
In Shutdown
5
20
µA
Typ
Max
Unit
VDD
V
60
150
mA
0.4
3.0
mV/V
DC ELECTRICAL CHARACTERISTICS (continued)
(VDD = 2.7V to 5.5V, VOUT unloaded; all specifications TMIN to TMAX unless otherwise noted)
Symbol
Parameter
Test Conditions
Min
(Notes 2 & 3)
0
OUTPUT CHARACTERISTICS
Vout
Output Voltage Range
VOSC
Short Circuit Current
Output Line Regulation
VDD=2.7V to 5.5V
-3.0
0.5xVDD
LOGIC INPUTS
VIH
Digital Input High
(Note 2)
VIL
Digital Input Low
(Note 2)
Digital Input Leakage
(Note 2)
Rev. A7
ICmic reserves the right to change specifications without prior notice
V
00.2xVDD
5
V
µA
5
ICM7620/7610/7600
AC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V to 5.5V, VOUT unloaded; all specifications TMIN to TMAX unless otherwise noted)
Symbol
SR
Parameter
Test Conditions
Min
Typ
Max
Unit
Slew Rate
2
V/µs
Settling Time
Mid-scale Transition Glitch
Energy
8
µs
nV-S
40
TIMING CHARACTERISTICS
(VDD = 2.7V to 5.5V, all specifications TMIN to TMAX unless otherwise noted)
Symbol
Parameter
Test Conditions
Min
Typ
Max
t1
Address to WR Setup Time
(Note 2)
5
ns
t2
Address to WR Hold Time
(Note 2)
0
ns
t3
Data to WR Setup Time
(Note 2)
20
ns
t4
Data to WR Hold Time
(Note 2)
0
ns
t5
WR Pulse Width
(Note 2)
15
ns
t6
LDAC Pulse Width
(Note 2)
15
ns
Note 1:
Linearity is defined from code 110 to 3990 (ICM7620)
Linearity is defined from code 16 to 1023 (ICM7610)
Linearity is defined from code 4 to 255 (ICM7600)
Guaranteed by design; not tested in production
See Applications Information
Note 2:
Note 3:
TIMING AND OPERATION DIAGRAM
t1
t5
t2
WR
ADDRESS
ADDRESS
VALID
t6
t3
LDAC
t4
DATA
VALID
DATA
6
Unit
Rev. A7
ICmic reserves the right to change specifications without prior notice
ICM7620/7610/7600
LDAC
WR
A1
A0
1
1
X
X
Input and DAC data latched
1
0
0
0
Input Latch transparent – DAC A
0
1
X
X
DAC Latch transparent – All DACs
0
0
0
0
DAC latch of All DACs transparent and DAC A input latch transparent
1
0
0
1
Input Latch transparent – DAC B
1
0
1
0
Input Latch transparent – DAC C
1
0
1
1
Input Latch transparent – DAC D
LATCH STATE
Table 1. Address Table
DETAILED DESCRIPTION
The ICM7620 is a 12-bit voltage output Quad DAC. The ICM7610 is the 10-bit version of this family and the ICM7600 is the 8-bit
version. These devices have a parallel interface and each DAC has a double buffered input. This family of DACs has a
guaranteed monotonic behavior. The operating supply range is from 2.7V to 5.5V.
Reference Input
The reference input accepts positive DC and AC signals. The voltage at REFIN sets the full-scale output voltage of all the DACs.
The reference input voltage range is from 0 to VDD-1.5V. The impedance at this pin is nominally about 40 K Ω. Each DACs output
amplifier is configured in a gain of 2 configuration. This means that the full-scale output of each DAC will be 2x VREF. To determine
the output voltage for any code, use the following equation.
VOUT = 2 x (VREF x (D / (2n)))
Where D is the numeric value of DAC’s decimal input code, VREF is the reference voltage and n is number of bits, i.e. 12 for
ICM7620, 10 for ICM7610 and 8 for ICM7600.
Output Buffer Amplifier
The Quad DAC has 4 output amplifiers connected in a gain of 2 configuration. These amplifiers have a wide output voltage swing.
The actual swing of the output amplifiers will be limited by offset error and gain error. See the Applications Information Section for
a more detailed discussion.
The output amplifier can drive a load of 2.0 K Ω to VDD or GND in parallel with a 500 pF load capacitance and has a full-scale
typical settling time of 8 µs.
Input Logic
This quad DAC family uses a standard straight parallel interface where D0 is the LSB and D11 is the MSB for the ICM7620, D9 is
the MSB for the ICM7610 and D7 is the MSB for the ICM7600. Each DAC has its own double buffered input with an input latch
and a DAC latch. Each DAC will go the voltage output that corresponds to the digital data that is stored in its DAC latch.
The WR Input (active low), controls the input latch data and the LDAC Input (active low) updates the DAC latches (Table 1).
Please refer to the Timing Diagram for more detail. The address inputs (A1, A0) control DAC addressing (Table 1).
Power-Down Mode
These parts offer shutdown capability to the user by means of the SHDN pin. When this pin is forced high all the DACs power
down and the REF input goes into high impedance state. The total current consumption will go down to below 10 µA in power
down mode. The data is stored in the latches during power down and the DACs will power up in the previous state when SHDN is
driven back to logic low.
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 output
will go to ground.
Rev. A7
ICmic reserves the right to change specifications without prior notice
7
ICM7620/7610/7600
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 1 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 ground. This is why the linearity is
specified for a starting code greater than zero.
Figure 2 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 dead-band of codes close to full-scale.
OFFSET AND
GAIN ERROR
VDD
DEADBAND
DEADBAND
NEGATIVE
OFFSET
POSITIVE
OFFSET
Figure 1. Effect of Negative Offset
8
Rev. A7
Figure 2. Effect of Gain Error and Positive Offset
ICmic reserves the right to change specifications without prior notice
ICM7620/7610/7600
PACKAGE INFORMATION
20 Lead TSSOP, 24 Lead TSSOP
Rev. A7
ICmic reserves the right to change specifications without prior notice
9
ICM7620/7610/7600
10
Rev. A7
ICmic reserves the right to change specifications without prior notice
ICM7620/7610/7600
Rev. A7
ICmic reserves the right to change specifications without prior notice
11
ICM7620/7610/7600
ORDERING INFORMATION
ICM76X0 P G
Device
2 - ICM7620
1 - ICM7610
0 - ICM7600
12
G = RoHS Compliant Lead-Free package.
Blank = Standard package. Non lead-free.
Package
T = TSSOP Package
Rev. A7
ICmic reserves the right to change specifications without prior notice
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