AD8842 Analog Devices, AD8842 Datasheet - Page 5

• Manufacturer Part Number: AD8842
• Description: 8-Bit Octal, 4-Quadrant Multiplying, CMOS TrimDAC
• Manufacturer: Analog Devices

Specifications of AD8842

• Resolution (bits): 8bit
• Dac Update Rate: 500kSPS
• Dac Settling Time: 2.9µs
• Max Pos Supply (v): +5.25V
• Single-supply: No
• Dac Type: Voltage Out
• Dac Input Format: Ser,SPI

REV.
CLK
L
X
X
X
*Data shifted into the SDI pin appears twelve clocks later at the SDO pin.
A
L
L
L
H
LD
LAST
LSB
D0
D1
D2
D3
DATA
D4
PR
H
H
L
H
X
MSB
D7
0
0
0
1
1
1
1
D5
Table II. Input Logic Control Truth Table
D6
0
0
1
0
0
1
1
D6
Table I. Serial Input Decode Table
MSB
D5
0
0
1
0
0
1
1
D7
LSB
D4
Input Shift Register Operation
No Operation
Shift One Bit in from SDI (Pin 20), Shift One Bit* Out from SDO (Pin 18)
All DAC Registers = 80
Load Serial Register Data into DAC(X) Register
Serial Data Input Register Loading Disabled
A0
0
0
1
0
0
1
1
ADDRESS
D3
A1
0
0
1
0
0
1
1
D2
A2
0
0
1
0
0
1
1
–5–
FIRST
MSB
MSB
A3
0
0
0
0
0
1
1
1
D1
A3
0
0
1
0
0
1
1
LSB
A2
0
0
0
0
1
0
0
1
D0
0
1
1
0
1
0
1
A1
0
0
1
1
0
0
0
1
–V
(1/128–1) x V
(127/128–1) x V
(128/128–1) x V
(129/128–1) x V
(254/128–1) x V
(255/128–1) x V
DAC OUTPUT VOLTAGE
V
OUT
IN
LSB
A0
H
0
1
0
1
0
0
1
1
= (D/128 –1) x V
NO OPERATION
DAC A
DAC B
DAC C
DAC D
DAC H
NO OPERATION
NO OPERATION
DAC UPDATED
IN
IN
IN
IN
IN
IN
= 0V; (PRESET VALUE)
V
IN
IN
AD8842