MAX19711ETN+T【PDF 15/36 页】IC ANLG FRNT END 56-TQFN

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MAX19711

10-Bit, 11Msps, Full-Duplex

Analog Front-End

______________________________________________________________________________________

Table 5. MAX19711 Tx, Rx, and FD Control Using SPI Commands

Shutdown mode offers the most dramatic power sav-

ings by shutting down all the analog sections (including

the reference) of the MAX19711. In shutdown mode,

the Rx ADC digital outputs are in tri-state mode, the Tx

DAC digital inputs are internally pulled to OVDD, and

the Tx DAC outputs are at 0V. When the Rx ADC out-

puts transition from tri-state to active mode, the last

converted word is placed on the digital output bus. The

Tx DAC previously stored data is lost when coming out

of shutdown mode. The wake-up time from shutdown

mode is dominated by the time required to charge the

capacitors at REFP, REFN, and COM. In internal refer-

ence mode and buffered external reference mode, the

wake-up time is typically 500s to enter Rx mode, 26s

to enter Tx mode, and 500s to enter FD mode.

In all operating modes the Tx DAC inputs DA0–DA9 are

internally pulled to OVDD. To reduce the supply current

of the MAX19711 in shutdown mode do not pull

DA0–DA9 low. This consideration is especially impor-

tant in shutdown mode to achieve the lowest quiescent

current.

In idle mode, the reference and clock distribution cir-

cuits are powered, but all other functions are off. The

ADDRESS

DATA BITS

MODE

FUNCTION

(Tx-Rx SWITCHING SPEED)

DESCRIPTION

COMMENT

SPI1-Rx

SLOW

Rx Mode:

Rx ADC = ON

Rx Bus = Enabled

Tx DAC = OFF

(Tx DAC outputs at 0V)

Tx Bus = OFF (all inputs

are pulled high)

Slow transition to Tx

mode from this

mode.

Low power.

SPI2-Tx

SLOW

Tx Mode:

Rx ADC = OFF

Rx Bus = Tri-state

Tx DAC = ON

Tx Bus = ON

Slow transition to Rx

mode from this

mode.

Low power.

SPI3-Rx

FAST

Rx Mode:

Rx ADC = ON

Rx Bus = Enabled

Tx DAC = ON

(Tx DAC outputs at

midscale)

Tx Bus = OFF (all inputs

are pulled high)

Fast transition to Tx

mode from this

mode. Moderate

power.

SPI4-Tx

FAST

Tx Mode:

Rx ADC = ON

Rx Bus = Tri-state

Tx DAC = ON

Tx Bus = ON

Fast transition to Rx

mode from this

mode. Moderate

power.

0000

(16-Bit Mode)

and

1000

(8-Bit Mode)

111

FAST

FD Mode:

Rx ADC = ON

Rx Bus = ON

Tx DAC = ON

Tx Bus = ON

Default Mode

Fast transition to any

mode. Moderate

power.

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