AD9284 Analog Devices, AD9284 Datasheet - Page 21

• Manufacturer Part Number: AD9284
• Description: 8-Bit, 250 MSPS, 1.8 V Dual Analog-to-Digital Converter (ADC)
• Manufacturer: Analog Devices

Specifications of AD9284

• Resolution (bits): 8bit
• # Chan: 2
• Sample Rate: 250MSPS
• Interface: Par
• Analog Input Type: Diff-Bip,SE-Uni
• Adc Architecture: Pipelined
• Pkg Type: CSP

MEMORY MAP REGISTER DESCRIPTIONS
For more information about functions controlled in Register 0x00
to Register 0xFF, see the
to High Speed ADCs via SPI.
Voltage Reference (Register 0x18)
Bits[7:5]—Reserved
Bits[4:0]—Voltage Reference
Bits[4:0] scale the internally generated voltage reference and,
consequently, the full scale of the analog input. Within this register,
the reference driver can be configured to be more easily driven
externally by reducing the capacitive loading.
The relationship between the V
is described by Equation 1. See Table 13 for a complete list of
register settings.
Input_Full_Scale = V
AN-877
REF
× 1.2
REF
voltage and the input full scale
Application Note, Interfacing
Rev. 0 | Page 21 of 24
(1)
Table 13. V
Value
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
REF
and Input Full Scale (Register 0x18)
V
0.844
0.857
0.87
0.883
0.896
0.909
0.922
0.935
0.948
0.961
0.974
0.987
1
1.013
1.026
1.039
1.052
1.065
1.078
1.091
1.104
1.117
1.13
1.143
1.156
1.169
1.182
1.195
1.208
1.221
1.234
External
REF
(V)
Full Scale (V)
1.013
1.028
1.044
1.060
1.075
1.091
1.106
1.122
1.138
1.153
1.169
1.184
1.200
1.216
1.231
1.247
1.262
1.278
1.294
1.309
1.325
1.340
1.356
1.372
1.387
1.403
1.418
1.434
1.450
1.465
1.481
External x 1.2
AD9284