Rainbow-electronics MAX1113 Manual do Utilizador descarregar pdf (Página 7)

MAX1112/MAX1113

+5V, Low-Power, Multi-Channel,

Serial 8-Bit ADCs

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Pin Description

16 SSTRB

Serial-Strobe Output. In internal clock mode, SSTRB goes low when the MAX1112/

MAX1113 begin the A/D conversion and goes high when the conversion is complete.

In external clock mode, SSTRB pulses high for two clock periods before the MSB is

shifted out. High impedance when CS is high (external clock mode only).

20 V

Positive Supply Voltage, +4.5V to +5.5V

Active-Low Chip Select. Data is not clocked into DIN unless CS is low. When CS is

high, DOUT is high impedance.

19 SCLK

Serial-Clock Input. Clocks data in and out of serial interface. In external clock mode,

SCLK also sets the conversion speed (duty cycle must be 45% to 55%).

17 DIN Serial-Data Input. Data is clocked in at SCLK’s rising edge.

12 REFOUT Internal Reference Generator Output. Bypass with a 1µF capacitor to AGND.

14 DGND Digital Ground

15 DOUT

Serial-Data Output. Data is clocked out on SCLK’s falling edge. High impedance when

CS is high.

13 AGND Analog Ground

SHDN

Three-Level Shutdown Input. Normally floats. Pulling SHDN low shuts the MAX1112/

MAX1113 down to 10µA (max) supply current; otherwise, the devices are fully opera-

tional. Pulling SHDN high shuts down the internal reference.

11 REFIN

Reference Voltage Input for Analog-to-Digital Conversion. Connect to REFOUT to use

the internal reference.

5–8 CH4–CH7 Sampling Analog Inputs

1–4 CH0–CH3 Sampling Analog Inputs

+5V

LOAD

DGND

DOUT

LOAD

DGND

DOUT

a) High-Z to V

and V

to V

b) High-Z to V

and V

to V

Figure 1. Load Circuits for Enable Time

+5V

LOAD

DGND

DOUT

LOAD

DGND

DOUT

a) V

to High-Z b) V

to High-Z

Figure 2. Load Circuits for Disable Time

—

1–4

59 COM

Ground Reference for Analog Inputs. Sets zero-code voltage in single-ended mode.

Must be stable to ±0.5LSB.

MAX1113

NAME FUNCTION

MAX1112

1 2 3 4 5 6 7 8 9 10 11 12 ... 19 20

MAX1112/MAX1113 1
Serial 8-Bit ADCs 1

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