MAX1188 Datasheet

IC型号：
MAX1188
PDF描述：
" 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog In...
文件大小：
337.78KB
芯片厂家：
Maxim

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16-Bit, 135ksps, Single-Supply ADCs with

Bipolar Analog Input Range

MAX1177/MAX1178/MAX1188

REF

MAX1177

AIN

161鈩?/div>

3.4k鈩?/div>

TRACK

HOLD

TRACK

HOLD

30pF

T/H OUT

POWER-

DOWN

R2 = 7.85k鈩?(MAX1188)

OR 3.92k鈩?(MAX1177/MAX1178)

S1, S2 = T/H SWITCH

S3 = POWER-DOWN

(MAX1178/MAX1188 ONLY)

R3 = 5.45k鈩?(MAX1188)

OR 17.79k鈩?(MAX1177/MAX1178)

HOLD

TRACK

HOLD

MAX1178/MAX1188

AIN

161鈩?/div>

3.4k鈩?/div>

TRACK

HOLD

30pF

T/H OUT

Figure 4. Equivalent Input Circuit

at least 12ms (C

REFADJ

= 0.1碌F, C

REF

= 10碌F) for the

internal reference to wake up and settle before starting

the conversion, if powering up from shutdown.

Selecting Standby or Shutdown Mode

The MAX1177/MAX1178/MAX1188 have a selectable

standby or low-power shutdown mode. In standby

mode, the ADC鈥檚 internal reference and reference

buffer do not power down between conversions, elimi-

nating the need to wait for the reference to power up

before performing the next conversion. Shutdown mode

powers down the reference and reference buffer after

completing a conversion. The reference and reference

buffer require a minimum of 12ms (C

REFADJ

= 0.1碌F,

REF

= 10碌F) to power up and settle from shutdown.

The state of R/C at the second falling edge of

selects which power-down mode the MAX1177/

MAX1178/MAX1188 enter upon conversion completion.

Holding R/C low causes the MAX1177/MAX1178/

MAX1188 to enter standby mode. The reference and

buffer are left on after the conversion completes. R/C

high causes the MAX1177/MAX1178/MAX1188 to enter

shutdown mode and power down the reference and

buffer after conversion (see Figures 5 and 6). Set the

voltage at R/C high during the second falling edge of

to realize the lowest current operation.

Standby Mode

While in standby mode, the supply current is less than

3.7mA (typ). The next falling edge of

with R/C low

causes the MAX1177/MAX1178/MAX1188 to exit stand-

by mode and begin acquisition. The reference and ref-

erence buffer remain active to allow quick turn-on time.

Shutdown Mode

In shutdown mode, the reference and reference buffer

are shut down between conversions. Shutdown mode

reduces supply current to 0.5碌A (typ) immediately after

the conversion. The next falling edge of

with R/C

low causes the reference and buffer to wake up and

enter acquisition mode. To achieve 16-bit accuracy,

allow 12ms (C

REFADJ

= 0.1碌F, C

REF

= 10碌F) for the

internal reference to wake up.

Internal and External Reference

Internal Reference

The internal reference of the MAX1177/MAX1178/

MAX1188 is internally buffered to provide +4.096V out-

put at REF. Bypass REF to AGND and REFADJ to

AGND with 10碌F and 0.1碌F, respectively. Sink or

source current at REFADJ to make fine adjustments to

the internal reference. The input impedance of REFADJ

is nominally 5k鈩? Use the circuit of Figure 7 to adjust

the internal reference to 卤1.5%.

_______________________________________________________________________________________

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