AD9644 Analog Devices, AD9644 Datasheet - Page 30

• Manufacturer Part Number: AD9644
• Description: 14-Bit, 80 MSPS/155 MSPS, 1.8V Dual, Serial Output A/D Converter
• Manufacturer: Analog Devices

Specifications of AD9644

• Resolution (bits): 14bit
• # Chan: 2
• Sample Rate: 155MSPS
• Analog Input Type: Diff-Bip
• Ain Range: 1.75 V p-p
• Adc Architecture: Pipelined

AD9644
Table 14. Flexible Output Test Modes from SPI Register 0x0D
Output Test Mode
Bit Sequence
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001 to 1110
1111
ADC TEST PATTERNS
SPI REGISTER 0x0D
BITS 3:0 ≠ 0000
ADC CORE
14-BIT
Pattern Name
Off (default)
Midscale short
+Full-scale short
−Full-scale short
Checkerboard
PN sequence long
PN sequence short
One-/zero-word toggle
User test mode
Not used
Ramp output
TAIL BITS
SPI REGISTER 0x62 BITS 5:4 =
JESD204A TEST PATTERNS
00 AND BITS 2:0 ≠ 000
CONSTRUCTION
16-BIT
JESD204A
SAMPLE
Figure 70. Block Diagram Showing Digital Test Modes
Digital Output Word 1
(Default Twos Complement
Format)
Not applicable
00 0000 0000 0000
01 1111 1111 1111
10 0000 0000 0000
10 1010 1010 1010
Not applicable
Not applicable
1111 1111 1111
User data from Register 0x19 to
Register 0x20
Not applicable
N
Rev. C | Page 30 of 44
CONSTRUCTION
FRAME
SPI REGISTER 0x62 BITS 5:4 =
SCRAMBLER
(OPTIONAL)
FRAMER
JESD204A TEST PATTERNS
01 AND BITS 2:0 ≠ 000
Digital Output Word 2
(Default Twos Complement
Format)
Not applicable
Same
Same
Same
01 0101 0101 0101
Not applicable
Not applicable
User data from Register 0x19 to
Register 0x20
Not applicable
N + 1
0000 0000 0000
10-BIT
8-BIT/10-BIT
ENCODER
SERALIZER
Data Sheet
Yes
Yes
Yes
Subject to Data
Format Select
Yes
No
Yes
Yes
No
Yes
No
OUTPUT