AD7948 Analog Devices, AD7948 Datasheet - Page 9

• Manufacturer Part Number: AD7948
• Description: +3.3 V/+5 V Multiplying 12-Bit DAC With an 8-Bit Byte Interface
• Manufacturer: Analog Devices

Specifications of AD7948

• Resolution (bits): 12bit
• Dac Update Rate: 1.7MSPS
• Dac Settling Time: 600ns
• Max Pos Supply (v): +5.5V
• Single-supply: Yes
• Dac Type: Current Out
• Dac Input Format: Byte

REV. B
Pin Mnemonic
I
I
AGND
STB1
LD1, LD2
SRI
STB2
STB3
STB4
DGND
CLR
V
V
R
Pin Mnemonic
I
AGND
DGND
DB11–DB0
CS
WR
V
V
R
OUT1
OUT2
OUT1
DD
REF
FB
DD
REF
FB
This pin connects to the back gates of the current steering switches. In normal operation, it should be connected
This is the Strobe 1 input. Data is clocked into the input shift register on the rising edge of this signal. STB3
Serial Data Input. Data on this line will be clocked into the input shift register on one of the Strobe inputs,
This is the Strobe 2 input. Data is clocked into the input shift register on the rising edge of this signal.
This is the Strobe 4 input. Data is clocked into the input shift register on the rising edge of this signal. STB3
Digital Ground.
This pin connects to the back gates of the current steering switches. The DAC I
Digital Ground.
Digital Data Inputs.
Description
DAC current output terminal 1.
DAC current output terminal 2. This should be connected to the AGND pin.
to the signal ground of the system. In biased single-supply operation it may be biased to some voltage between
0 V and the 1.23 V. See Figure 11 for more details.
Active low inputs. When both of these are low, the DAC register is updated and the output will change to
reflect this.
when they are enabled.
STB3 must be high. STB1, STB4 must be low.
This is the Strobe 3 input. Data is clocked into the input shift register on the falling edge of this signal. STB1,
STB2, STB4, must be low.
must be high. STB1, STB2 must be low.
Asynchronous CLR input. When this input is taken low, all 0s are loaded to the DAC latch.
Power supply input. This is nominally +5 V for Normal Mode Operation and +3.3 V to +5 V for Biased
Mode Operation.
DAC reference input.
DAC feedback resistor pin.
Description
DAC current output terminal 1.
internally to this point.
Active Low, Chip Select Input.
Active Low, Write Input.
Power supply input. This is nominally +5 V for Normal Mode Operation and +3.3 V to +5 V for Biased Mode
Operation.
DAC reference input.
DAC feedback resistor pin.
must be high. STB2, STB4 must be low.
AD7943 PIN FUNCTION DESCRIPTIONS
AD7945 PIN FUNCTION DESCRIPTIONS
–9–
AD7943/AD7945/AD7948
OUT2
terminal is also connected