MAX1021 datasheet(33/47 Pages) MAXIM

33 / 47 page

10-Bit, Multichannel ADCs/DACs with FIFO,

Temperature Sensing, and GPIO Ports

______________________________________________________________________________________

Output-Data Format

Figures 6–9 illustrate the conversion timing for the

MAX1020–MAX1023/MAX1057/MAX1058. All 10-bit

conversion 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

two’s complement 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

(MAX1021/MAX1023/MAX1057) and 1 LSB = VREF1 /

1024 (MAX1020/MAX1022/MAX1058) for unipolar and

bipolar operation, and 1 LSB = +0.125°C for tempera-

ture measurements. Bipolar true-differential results and

temperature-sensor results are available in two’s com-

plement 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.

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

CONTROL

BITS

DATA BITS

C3 C2 C1 C0

D3 D2 D1 D0

DESCRIPTION

FUNCTION

——— ————— 0

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 DAC’s present state.

——— ————— 0

Power-Down 1

Power down individual DAC buffers indicated by

data in DAC0 through DAC7. A one indicates the

DAC output is disconnected and high impedance.

A zero does not affect the DAC’s present state.

——— ————— 1

Power-Down 2

Power down individual DAC buffers indicated by

data in DAC0 through DAC7. A one indicates the

DAC output is disconnected and pulled to AGND

with a 1k

Ω resistor. A zero does not affect the DAC’s

present state.

——— ————— 0

Power-Down 3

Power down individual DAC buffers indicated by

data in DAC0 through DAC7. A one indicates the

DAC output is disconnected and pulled to AGND

with a 100k

Ω resistor. A zero does not affect the

DAC’s present state.

——— ————— 1

Power-Down 4

Power down individual DAC buffers indicated by

data in DAC0 through DAC7. A one indicates the

DAC output is disconnected and pulled to REF1 with

a 100k

Ω resistor. A zero does not affect the DAC’s

present state.

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