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| 型号： | AD7708BRZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/44页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT R-R 8/10CH 28SOIC |
| 标准包装： | 400 |
| 位数： | 16 |
| 采样率（每秒）： | 1.37k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 3.84mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 4 个差分，单极；4 个差分，双极；8 个伪差分，单极；8 个伪差分，双极 |
| 配用： | EVAL-AD7708EBZ-ND - BOARD EVAL FOR AD7708 |
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REV. 0
–28–
AD7708/AD7718
Operating Characteristics when Addressing the Mode and Control Registers
1. Any change to the MD bits will immediately reset the ADCs. A write to the MD2–MD0 bits with no change is also treated as a reset.
2. Once the MODE has been written with a calibration mode, the RDY bit (STATUS) is immediately reset and the calibration
commences. On completion the appropriate calibration registers are written, the bit in STATUS register is updated and the
MD2–MD0 bits are reset to 001 to indicate the ADC is back in idle mode.
3. Calibrations are performed with the maximum allowable SF value with chop enabled. SF register is reset to user configuration
after calibration with chop enabled. Calibrations are performed with the selected value of SF when chop is disabled.
ADC Control Register (ADCCON): (A3, A2, A1, A0 = 0, 0, 1, 0; Power-On-Reset = 07 Hex)
The ADC Control Register is an 8-bit register from which data can be read or to which data can be written. This register is used to
configure the ADC for range, channel selection, and unipolar or bipolar coding. Table XVI outlines the bit designations for the ADC
control register ADCCON7 through ADCCON0 indicate the bit location, ADCCON denoting the bits are in the ADC Control
Register. ADCCON7 denotes the first bit of the data stream. The number in brackets indicates the power-on/reset default status of
that bit.
Table XVI. ADC Control Register (ADCCON) Bit Designations
Bit
Location
Mnemonic
Description
ADCCON7
CH3
ADC Channel Selection Bits. Written by the user to select either pseudo-differential or fully-
ADCCON6
CH2
differential input pairs used by the ADC as follows:
ADCCON5
CH1
ADCCON4
CH0
8-Channel Configuration
10-Channel Configuration
(CHCON = 0)
(CHCON = 1)
Positive
Negative
Cal Register
Positive
Negative
Cal Register
CH3
CH2
CH1
CH0
Input
Pair
Input
Pair
0
AIN1
AINCOM
1
AIN1
AINCOM
1
0
1
AIN2
AINCOM
2
AIN2
AINCOM
2
0
1
0
AIN3
AINCOM
3
AIN3
AINCOM
3
0
1
AIN4
AINCOM
4
AIN4
AINCOM
4
0
1
0
AIN5
AINCOM
1
AIN5
AINCOM
5
0
1
0
1
AIN6
AINCOM
2
AIN6
AINCOM
1
0
1
0
AIN7
AINCOM
3
AIN7
AINCOM
2
0
1
AIN8
AINCOM
4
AIN8
AINCOM
3
1
0
AIN1
AIN2
1
AIN1
AIN2
1
0
1
AIN3
AIN4
2
AIN3
AIN4
2
1
0
1
0
AIN5
AIN6
3
AIN5
AIN6
3
1
0
1
AIN7
AIN8
4
AIN7
AIN8
4
1
0
AIN2
1
AIN9
AIN10
5
1
0
1
AINCOM
1
AINCOM
1
0
REFIN(+)
REFIN(–)
1
AIN9
AINCOM
4
1
OPEN
1
AIN10
AINCOM
5
ADCCON3
U/
B
Unipolar/Bipolar Bit.
Set by user to enable unipolar coding i.e., zero differential input will result in 000000hex
output and a full-scale differential input will result in FFFFFF Hex output when operated in
24-bit mode.
Cleared by user to enable bipolar coding, Negative full-scale differential input will result in an
output code of 000000 Hex, zero differential input will result in an output code of 800000 Hex
and a positive full-scale differential input will result in an output code of FFFFFF Hex.
ADCCON7
ADCCON6
ADCCON5
ADCCON4
ADCCON3
ADCCON2
ADCCON1
ADCCON0
CH3 (0)
CH2 (0)
CH1 (0)
CH0 (0)
U/
B (0)
RN2 (1)
RN1 (1)
RN0 (1)
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