AD4003/AD4007/AD4011

Data Sheet

Rev. B | Page 10 of 38

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

VIO

10

SDI

9

SCK

8

SDO

7

CNV

6

AD4003/

AD4007

TOP VIEW

(Not to Scale)

Figure 3. 10-Lead MSOP Pin Configuration

REF

VDD

IN+

IN–

GND

VIO

SDI

SCK

SDO

CNV

NOTES

1. CONNECT THE EXPOSED PAD TO GND.

THIS CONNECTION IS NOT REQUIRED TO

MEET THE SPECIFIED PERFORMANCE.

1

2

3

4

5

10

9

8

7

6

AD4003/

AD4007/

AD4011

TOP VIEW

(Not to Scale)

Figure 4. 10-Lead LFCSP Pin Configuration

Table 7. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

REF

AI

decoupled closely to the GND pin with a 10 μF X7R ceramic capacitor.

2

VDD

P

1.8 V Power Supply. The VDD range is 1.71 V to 1.89 V. Bypass VDD to GND with a 0.1 μF ceramic

capacitor.

3

IN+

AI

Differential Positive Analog Input. See the Differential Input Considerations section.

4

IN−

AI

Differential Negative Analog Input. See the Differential Input Considerations section.

5

GND

P

Power Supply Ground.

6

CNV

DI

Convert Input. This input has multiple functions. On its leading edge, it initiates the conversions and

selects the interface mode of the device: daisy-chain mode or CS mode. In CS mode, the SDO pin is

enabled when CNV is low. In daisy-chain mode, the data is read when CNV is high.

7

SDO

DO

Serial Data Output. The conversion result is output on this pin. It is synchronized to SCK.

8

SCK

DI

Serial Data Clock Input. When the device is selected, the conversion result is shifted out by this clock.

9

SDI

DI

Serial Data Input. This input provides multiple features. It selects the interface mode of the ADC as

follows:

Daisy-chain mode is selected if SDI is low during the CNV rising edge. In this mode, SDI is used as a data

input to daisy-chain the conversion results of two or more ADCs onto a single SDO line. The digital data

level on SDI is output on SDO with a delay of 18 SCK cycles.

CS mode is selected if SDI is high during the CNV rising edge. In this mode, either SDI or CNV can enable

the serial output signals when low. If SDI or CNV is low when the conversion is complete, the busy

indicator feature is enabled. With CNV low, the device can be programmed by clocking in a 16-bit word

on SDI on the rising edge of SCK.

10

VIO

P

Input/Output Interface Digital Power. Nominally, this pin is at the same supply as the host interface (1.8 V,

2.5 V, 3 V, or 5 V). Bypass VIO to GND with a 0.1 μF ceramic capacitor.

EPAD

P

Exposed Pad (LFCSP Only). Connect the exposed pad to GND. This connection is not required to meet

the specified performance.