AD7911 查看數據表（PDF） - Analog Devices

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AD7911

2-Channel, 2.35 V to 5.25 V 250 kSPS, 10-/12-Bit ADCs

Analog Devices 

AD7911/AD7921

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

8-LEAD TSOT

DIN 1 AD7911/ 8 VIN1

SCLK 2 AD7921 7 VIN0

CS 3 TOP VIEW 6 GND

DOUT 4 (Not to Scale) 5 VDD

Figure 8. 8-Lead TSOT Pin Configuration

8-LEAD MSOP

DOUT 1 AD7911/ 8 VDD

CS 2 AD7921 7 GND

SCLK 3 TOP VIEW 6 VIN0

DIN 4 (Not to Scale) 5 VIN1

Figure 9. 8-Lead MSOP Pin Configuration

Table 5. Pin Function Descriptions

TSOT MSOP

Pin No. Pin No. Mnemonic Function

1

4

DIN

Data In. Logic input. The channel to be converted is provided on this input and is clocked into an

internal register on the falling edge of SCLK.

2

3

SCLK

Serial Clock. Logic input. SCLK provides the serial clock for accessing data from the part. This clock

input is also used as the clock source for the AD7911/AD7921’s conversion process.

3

2

CS

Chip Select. Active low logic input. This input provides the dual function of initiating conversions on

the AD7911/AD7921 and framing the serial data transfer.

4

1

DOUT

Data Out. Logic output. The conversion result from the AD7911/AD7921 is provided on this output as a

serial data stream. The bits are clocked out on the falling edge of the SCLK signal.

For the AD7921, the data stream consists of two leading zeros; the channel identifier bit, which

identifies the channel that the conversion result corresponds to; followed by an invalid bit that

matches up to the channel identifier bit; followed by the 12 bits of conversion data, with MSB first.

For the AD7911, the data stream consists of two leading zeros; the channel identifier bit, which

identifies the channel that the conversion result corresponds to; followed by an invalid bit that

matches up to the channel identifier bit; followed by the 10 bits of conversion data, with MSB first and

two trailing zeros.

5

8

VDD

Power Supply Input. The VDD range for the AD7911/AD7921 is from 2.35 V to 5.25 V.

6

7

GND

Analog Ground. Ground reference point for all circuitry on the AD7911/AD7921. All analog input

signals should be referred to this GND voltage.

7, 8

6, 5

VIN0, VIN1

Analog Inputs. These two single-ended analog input channels are multiplexed into the on-chip track-

and-hold amplifier. The analog input channel to be converted is selected by writing to the third MSB

on the DIN pin. The input range is 0 to VDD.

Rev. A | Page 10 of 28

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