MAX1020_12 Datasheet, PDF(33/44 Page) Maxim Integrated Products – 10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports

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MAX1020_12 Datasheet, PDF (33/44 Pages) Maxim Integrated Products – 10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports

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10-Bit, Multichannel ADCs/DACs with FIFO,

Temperature Sensing, and GPIO Ports

Table 21. DAC Power-Up and Power-Down Commands

CONTROL

BITS

C3 C2 C1 C0

DATA BITS

DESCRIPTION

D3 D2 D1 D0

FUNCTION

1 1 1 1 ââââââââ 0 0 1 X

Power-Up

Power up individual DAC buffers indicated by data

in DAC0 through DAC7. A one indicates the DAC

output is connected and active. A zero does not

affect the DACâs present state.

Power down individual DAC buffers indicated by

1 ââââââââ 0

Power-Down 1

data in DAC0 through DAC7. A one indicates the

DAC output is disconnected and high impedance.

A zero does not affect the DACâs present state.

Power down individual DAC buffers indicated by

data in DAC0 through DAC7. A one indicates the

1 1 1 1 â â â â â â â â 1 0 0 X Power-Down 2 DAC output is disconnected and pulled to AGND

with a 1kâ¦ resistor. A zero does not affect the DACâs

present state.

Power down individual DAC buffers indicated by

data in DAC0 through DAC7. A one indicates the

1 1 1 1 â â â â â â â â 0 0 0 X Power-Down 3 DAC output is disconnected and pulled to AGND

with a 100kâ¦ resistor. A zero does not affect the

DACâs present state.

Power down individual DAC buffers indicated by

data in DAC0 through DAC7. A one indicates the

1 1 1 1 â â â â â â â â 1 1 1 X Power-Down 4 DAC output is disconnected and pulled to REF1 with

a 100kâ¦ resistor. A zero does not affect the DACâs

present state.

Output-Data Format

Figures 6â9 illustrate the conversion timing for the

MAX1020/MAX1022/MAX1057/MAX1058. All 10-bit con-

version results are output in 2-byte format, MSB first,

with four leading zeros and with the LSB followed by 2

sub-bits. Data appears on DOUT on the falling edges of

SCLK. Data is binary for unipolar mode and twoâs com-

plement for bipolar mode and temperature results. See

Figures 3, 4, and 5 for input/output and temperature-

transfer functions.

ADC Transfer Functions

Figure 3 shows the unipolar transfer function for single-

ended or differential inputs. Figure 4 shows the bipolar

transfer function for differential inputs. Code transitions

occur halfway between successive-integer LSB values.

Output coding is binary, with 1 LSB = VREF1 / 1024

(MAX1057) and 1 LSB = VREF1 / 1024 (MAX1020/

MAX1022/MAX1058) for unipolar and bipolar operation,

and 1 LSB = +0.125Â°C for temperature measurements.

Bipolar true-differential results and temperature-sensor

results are available in twoâs complement format, while

all others are in binary. See Tables 6, 7, and 8 for

details on which setting (unipolar or bipolar) takes

precedence.

In unipolar mode, AIN+ can exceed AIN- by up to

VREF1. In bipolar mode, either input can exceed the

other by up to VREF1 / 2.

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