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| 型号： | AD7785BRUZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 32/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 20BIT 3CH LN LP 16-TSSOP |
| 标准包装： | 2,500 |
| 位数： | 20 |
| 采样率（每秒）： | 470 |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 3 个差分，单极；3 个差分，双极 |
| 配用： | EVAL-AD7785EBZ-ND - BOARD EVALUATION FOR AD7785 |
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AD7785
Rev. 0 | Page 9 of 32
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
06
72
1-
00
5
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CLK
CS
IOUT1
AIN2(+)
AIN1(–)
AIN1(+)
SCLK
DOUT/RDY
DVDD
AVDD
REFIN(–)/AIN3(–)
AIN2(–)
REFIN(+)/AIN3(+)
IOUT2
GND
DIN
AD7785
TOP VIEW
(Not to Scale)
Figure 5. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
SCLK
Serial Clock Input. This serial clock input is for data transfers to and from the ADC. The SCLK has a Schmitt-
triggered input, making the interface suitable for opto-isolated applications. The serial clock can be
continuous with all data transmitted in a continuous train of pulses. Alternatively, it can be a noncontinuous
clock with the information being transmitted to or from the ADC in smaller batches of data.
2
CLK
Clock In/Clock Out. The internal clock can be made available at this pin. Alternatively, the internal clock can
be disabled, and the ADC can be driven by an external clock. This allows several ADCs to be driven from a
common clock, allowing simultaneous conversions to be performed.
3
CS
Chip Select Input. This is an active low logic input used to select the ADC. CS can be used to select the ADC
in systems with more than one device on the serial bus or as a frame synchronization signal in communicating
with the device. CS can be hardwired low, allowing the ADC to operate in 3-wire mode with SCLK, DIN, and
DOUT used to interface with the device.
4
IOUT1
Output of Internal Excitation Current Source. The internal excitation current source can be made available at
this pin. The excitation current source is programmable so that the current can be 10 μA, 210 μA, or 1 mA.
Either IEXC1 or IEXC2 can be switched to this output.
5
AIN1(+)
Analog Input. AIN1(+) is the positive terminal of the differential analog input pair AIN1(+)/AIN1(
).
6
AIN1(
)
Analog Input. AIN1(
) is the negative terminal of the differential analog input pair AIN1(+)/AIN1().
7
AIN2(+)
Analog Input. AIN2(+) is the positive terminal of the differential analog input pair AIN2(+)/AIN2(
).
8
AIN2(
)
Analog Input. AIN2(
) is the negative terminal of the differential analog input pair AIN2(+)/AIN2().
9
REFIN(+)/AIN3(+)
Positive Reference Input/Analog Input. An external reference can be applied between REFIN(+) and
REFIN(
). REFIN(+) can lie anywhere between AVDD and GND + 0.1 V. The nominal reference voltage
REFIN(+)
REFIN() is 2.5 V, but the part functions with a reference from 0.1 V to AVDD. Alternatively, this
pin can function as AIN3(+) where AIN3(+) is the positive terminal of the differential analog input pair
AIN3(+)/AIN3(
).
10
REFIN(
)/AIN3()
Negative Reference Input/Analog Input. REFIN(
) is the negative reference input for REFIN. This reference
input can lie anywhere between GND and AVDD
0.1 V. This pin also functions as AIN3(), which is the
negative terminal of the differential analog input pair AIN3(+)/AIN3(
).
11
IOUT2
Output of Internal Excitation Current Source. The internal excitation current source can be made available at
this pin. The excitation current source is programmable so that the current can be 10 μA, 210 μA, or 1 mA.
Either IEXC1 or IEXC2 can be switched to this output.
12
GND
Ground Reference Point.
13
AVDD
Supply Voltage, 2.7 V to 5.25 V.
14
DVDD
Digital Interface Supply Voltage. The logic levels for the serial interface pins are related to this supply, which
is between 2.7 V and 5.25 V. The DVDD voltage is independent of the voltage on AVDD; therefore, AVDD can
equal 5 V with DVDD at 3 V or vice versa.
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