AD5722R Analog Devices, AD5722R Datasheet - Page 10

• Manufacturer Part Number: AD5722R
• Description: Complete, Dual, 12-Bit, Serial Input, Unipolar/Bipolar, Voltage Output DAC
• Manufacturer: Analog Devices

Specifications of AD5722R

• Resolution (bits): 12bit
• Dac Update Rate: 1.07MSPS
• Dac Settling Time: 7.5µs
• Max Pos Supply (v): +16.5V
• Single-supply: Yes
• Dac Type: Voltage Out
• Dac Input Format: Ser,SPI

AD5722R/AD5732R/AD5752R
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 6. Pin Function Descriptions
Pin No.
1
2, 4, 6, 12,
13, 22
3
5
7
8
9
10
11
14
15
16
17
18, 19
20, 21
23
24
Exposed
Paddle
Mnemonic
AV
NC
V
BIN/2sCOMP
SYNC
SCLK
SDIN
LDAC
CLR
DV
GND
SDO
REFIN/REFOUT
DAC_GND
SIG_GND
V
AV
OUT
OUT
SS
DD
CC
A
B
Description
Negative Analog Supply. Voltage ranges from −4.5 V to −16.5 V. This pin can be connected to 0 V if output
ranges are unipolar.
Do not connect to these pins.
Analog Output Voltage of DAC A. The output amplifier is capable of directly driving a 2 kΩ, 4000 pF load.
Determines the DAC coding for a bipolar output range. This pin should be hardwired to either DV
When hardwired to DV
complement. (For unipolar output ranges, coding is always straight binary.)
Active Low Input. This is the frame synchronization signal for the serial interface. While SYNC is low, data is
transferred on the falling edge of SCLK. Data is latched on the rising edge of SYNC.
Serial Clock Input. Data is clocked into the shift register on the falling edge of SCLK. This operates at clock
speeds up to 30 MHz.
Serial Data Input. Data must be valid on the falling edge of SCLK.
Load DAC, Logic Input. This is used to update the DAC registers and, consequently, the analog output. When
this pin is tied permanently low, the addressed DAC register is updated on the rising edge of SYNC. If LDAC is
held high during the write cycle, the DAC input register is updated, but the output update is held off until the
falling edge of LDAC. In this mode, all analog outputs can be updated simultaneously on the falling edge of
LDAC. The LDAC pin should not be left unconnected.
Active Low Input. Asserting this pin sets the DAC registers to zero-scale code or midscale code (user selectable).
Digital Supply. Voltage ranges from 2.7 V to 5.5 V.
Ground Reference.
Serial Data Output. Used to clock data from the serial register in daisy-chain or readback mode. Data is
clocked out on the rising edge of SCLK and is valid on the falling edge of SCLK.
External Reference Voltage Input and Internal Reference Voltage Output. Reference input range is 2 V to 3 V.
REFIN = 2.5 V for specified performance. REFOUT = 2.5 V ± 2 mV.
Ground Reference for the Four Digital-to-Analog Converters.
Ground Reference for the Four Output Amplifiers.
Analog Output Voltage of DAC B. The output amplifier is capable of directly driving a 2 kΩ, 4000 pF load.
Positive Analog Supply. Voltage ranges from 4.5 V to 16.5 V.
This exposed paddle should be connected to the potential of the AV
unconnected. It is recommended that the paddle be thermally connected to a copper plane for enhanced thermal
performance.
BIN/2sCOMP
NOTES
1. NC = NO CONNECT
2. IT IS RECOMMENDED THAT THE EXPOSED PAD BE
THERMALLY CONNECTED TO A COPPER PLANE
FOR ENHANCED THERMAL PERFORMANCE.
V
SYNC
LDAC
SCLK
AV
OUT
CC
SDIN
CLR
NC
NC
NC
NC
, input coding is offset binary. When hardwired to GND, input coding is twos
SS
A
Figure 5. Pin Configuration
10
11
12
1
2
3
4
5
6
7
8
9
Rev. D | Page 10 of 32
(Not to Scale)
AD5722R/
AD5732R/
AD5752R
TOP VIEW
24
23
22
21
20
19
18
17
16
15
14
13
AV
V
NC
SIG_GND
SIG_GND
REFIN/REFOUT
SDO
GND
DAC_GND
DAC_GND
DV
NC
OUT
DD
CC
B
SS
pin, or alternatively, it can be left electrically
CC
or GND.