AD9781 Analog Devices, AD9781 Datasheet - Page 7

• Manufacturer Part Number: AD9781
• Description: Dual 14-Bit, LVDS Interface 500 MSPS DAC
• Manufacturer: Analog Devices

Specifications of AD9781

• Resolution (bits): 14bit
• Dac Update Rate: 500MSPS
• Dac Settling Time: n/a
• Max Pos Supply (v): +3.47V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: LVDS,Par

Table 7. AD9781 Pin Function Descriptions
Pin No.
1, 6
2, 5
3, 4
7, 28, 48
8, 47
9 to 24, 31 to 42
25, 26
27
29, 30
43 to 46
49
50
51
52
53
54
55
56, 57, 71, 72
58, 61, 64, 67, 70
59
60
62, 63
65, 66
68
69
Heat Sink Pad
Mnemonic
CVDD18
CVSS
CLKP, CLKN
DVSS
DVDD18
D13P, D13N to D0P, D0N
DCOP, DCON
DVDD33
DCIP, DCIN
NC
SDO
SDIO
SCLK
CSB
RESET
FS ADJ
REFIO
AVDD33
AVSS
IOUT2P
IOUT2N
AUX2P, AUX2N
AUX1N, AUX1P
IOUT1N
IOUT1P
N/A
CVDD18
CVDD18
DVDD18
NOTES
1. NC = NO CONNECT
2. EXPOSED PAD MUST BE
CVSS
CLKN
CVSS
DVSS
SOLDERED TO PCB AND
CONNECTED TO AVSS.
CLKP
D13N
D12N
D10N
D13P
D12P
D11P
D11N
D10P
D9N
D9P
10
12
13
14
15
16
17
18
11
1
2
3
4
5
6
7
8
9
Description
Clock Supply Voltage (1.8 V).
Clock Supply Return.
Differential DAC Sampling Clock Input.
Digital Common.
Digital Supply Voltage (1.8 V).
LVDS Data Inputs. D13 is the MSB, D0 is the LSB.
Differential Data Clock Output. LVDS clock at the DAC sample rate.
Digital Input and Output Pad Ring Supply Voltage (3.3 V).
Differential Data Clock Input. LVDS clock aligned with input data.
No Connection. Leave these pins floating.
Serial Port Data Output.
Serial Port Data Input (4-Wire Mode) or Bidirectional Serial Data Line (3-Wire Mode).
Serial Port Clock Input.
Serial Port Chip Select (Active Low).
Chip Reset (Active High).
Full-Scale Current Output Adjust.
Analog Reference Input/Output (1.2 V Nominal).
Analog Supply Voltage (3.3 V).
Analog Common.
DAC Current Output. Full-scale current is sourced when all data bits are 1s.
Complementary DAC Current Output. Full-scale current is sourced when all data bits are 0s.
Differential Auxiliary DAC Current Output (Channel 2).
Differential Auxiliary DAC Current Output (Channel 1).
Complementary DAC Current Output. Full-scale current is sourced when all data bits are 0s.
DAC Current Output. Full-scale current is sourced when all data bits are 1s.
The heat sink pad on the bottom of the package should be soldered to the PCB plane that
carries AVSS.
Figure 3. AD9781 Pin Configuration
PIN 1
INDICATOR
Rev. A | Page 7 of 36
(TOP VIEW)
AD9781
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
FS ADJ
RESET
CSB
SCLK
SDIO
SDO
DVSS
DVDD18
NC
NC
NC
NC
D0N
D0P
D1N
D1P
D2N
D2P
AD9780/AD9781/AD9783