AD4002 datasheet(29/39 Pages) AD

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Data Sheet

AD4002/AD4006/AD4010

Rev. A | Page 29 of 39

STATUS BITS

A set of six optional status bits can be appended to the end of

each conversion result. The status bits allow the digital host to

check the state of the input overvoltage protection circuit and

verify that the ADC features are configured correctly without

interrupting conversions. The status bits are enabled when the

status bits enable field in the configuration register is set to 1

(see the Configuration Register Details section). Table 15 shows

a description of each status bit.

When enabled, the status bits are clocked out MSB first starting

on the SCK falling edge immediately following the LSB of the

conversion result. The SDO line returns to high impedance

after the sixth status bit is clocked out (except in daisy-chain

mode). The user is not required to clock out all status bits to

start the next conversion. For example, if the digital host needs

to monitor the OV clamp flag but also needs to minimize the

SCK frequency, the remaining status bits can be ignored to limit

the number of SCK pulses required per conversion period.

When using multiple AD4002/AD4006/AD4010 devices in

daisy-chain mode, however, all six status bits must be clocked

out for each connected device.

Figure 50 shows the serial interface timing for CS mode, 3-wire

without busy indicator with all six status bits clocked out.

Table 15. Status Bit Descriptions

Bit

Bit Name

Description

OV clamp flag

Indicates the state of the OV clamp

flag in the configuration register.

Span compression

Indicates the state of the span

compression enable field in the

configuration register.

High-Z mode

Indicates the state of the High-Z

mode enable field in the

configuration register.

Turbo mode

Indicates the state of the turbo mode

enable field in the configuration

[1:0]

Reserved

Reserved.

SDO

D17

D16

D15

SCK

tSCK

tSCKL

tSCKH

tHSDO

tDSDO

CN V

CONVERSION

ACQUISITION

tCYC

ACQUISITION

SDI = 1

tCNVH

ACQ

tEN

tQUIET2

STATUS BITS B5 to B0

tDIS

tCONV

Figure 50. CS Mode, 3-Wire Without Busy Indicator Serial Interface Timing Diagram, Including Status Bits

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