AD4011 datasheet(32/38 Pages) AD

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AD4003/AD4007/AD4011

Data Sheet

Rev. B | Page 32 of 38

CS MODE, 4-WIRE TURBO MODE

This mode is typically used when a single AD4003/AD4007/

AD4011 is connected to an SPI-compatible digital host. It provides

additional time during the end of the ADC conversion process

to clock out the previous conversion result, giving a lower SCK

rate. The AD4003 can achieve a throughput rate of 2 MSPS only

when turbo mode is enabled and using a minimum SCK rate of

75 MHz. With turbo mode enabled, the AD4007 can also achieve

its maximum throughput rate of 1 MSPS with a minimum SCK

rate of 25 MHz, and the AD4011 can achieve its maximum

throughput rate of 500 kSPS with a minimum SCK rate of 11 MHz.

The connection diagram is shown in Figure 59, and the corre-

sponding timing diagram is shown in Figure 60.

This mode replaces the 4-wire with busy indicator mode by

programming the turbo mode bit, Bit 1 (see Table 14).

With SDI high, a rising edge on CNV initiates a conversion.

The previous conversion data is available to read after the CNV

rising edge. The user must wait tQUIET1 time after CNV is brought

high before bringing SDI low to clock out the previous conversion

result. The user must also wait tQUIET2 time after the last falling

edge of SCK to when CNV is brought high.

When the conversion is complete, the AD4003/AD4007/AD4011

enter the acquisition phase and power down. The ADC result

can be read by bringing its SDI input low, which consequently

outputs the MSB onto SDO. The remaining data bits are then

clocked by subsequent SCK falling edges. The data is valid on

both SCK edges. Although the rising edge can capture the data,

a digital host using the SCK falling edge allows a faster reading

rate, provided it has an acceptable hold time. After the 18th SCK

falling edge or when SDI goes high (whichever occurs first), SDO

returns to high impedance.

SDI

SDO

CNV

SCK

CONVERT

DATA IN

CLK

DIGITAL HOST

IRQ

VIO

1kΩ

CS1

AD4003/

AD4007/

AD4011

Figure 59. CS Mode, 4-Wire Turbo Mode Connection Diagram

ACQUISITION

SDO

SCK

ACQUISITION

SDI

CNV

tSSDICNV

tHSDICNV

tCYC

tSCK

tSCKL

tEN

tHSDO

tDSDO

tDIS

tSCKH

D17

D16

D15

tQUIET1

tQUIET2

tACQ

CONVERSION

tCONV

Figure 60. CS Mode, 4-Wire Turbo Mode Timing Diagram

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