Rainbow Electronics MAX1035 - Manual (Page 12)

MAX1034/MAX1035
8-/4-Channel, ±V
REF
Multirange Inputs,
Serial 14-Bit ADCs
12 ______________________________________________________________________________________
Pin Description
PIN
MAX1034 MAX1035
NAME FUNCTION
1 2 AV DD1
Analog Supply Voltage 1. Connect AV DD1 to a +4.75V to +5.25V power-supply voltage.
Bypass AV DD1 to AGND1 with a 0.1µF capacitor.
2 3 CH0 Analog Input Channel 0
3 4 CH1 Analog Input Channel 1
4 5 CH2 Analog Input Channel 2
5 6 CH3 Analog Input Channel 3
6 — CH4 Analog Input Channel 4
7 — CH5 Analog Input Channel 5
8 — CH6 Analog Input Channel 6
9 — CH7 Analog Input Channel 7
10 7 CS
Active-Low Chip-Select Input. When CS is low, data is clocked into the device from DIN on
the rising edge of SCLK. With CS low, data is clocked out of DOUT on the falling edge of
SCLK. When CS is high, activity on SCLK and DIN is ignored and DOUT is high impedance.
11 8 DIN
Serial Data Input. When CS is low, data is clocked in on the rising edge of SCLK. When CS is
high, transitions on DIN are ignored.
12 9 SSTRB
Serial-Strobe Output. When using the internal clock, SSTRB rising edge transitions indicate
that data is ready to be read from the device. When operating in external clock mode, SSTRB
is always low. SSTRB does not tri-state, regardless of the state of
CS, and therefore requires
a dedicated I/O line.
13 10 SCLK
Serial Clock Input. When CS is low, transitions on SCLK clock data into DIN and out of DOUT.
When CS is high, transitions on SCLK are ignored.
14 11 DOUT
Serial Data Output. When CS is low, data is clocked out of DOUT with each falling SCLK
transition. When CS is high, DOUT is high impedance.
15 12 DGNDO D i gi tal I/O Gr ound . D GND , DGN D O, AGN D 3, AGND 2, and AGN D1 m ust be connected tog ether.
16 13 DGND Digital Ground. DGND, DGNDO, AGND3, AGND2, and AGND1 must be connected together.
17 14 DV DDO
Digital I/O Supply Voltage Input. Connect DV DDO to a +2.7V to +5.25V power-supply voltage.
Bypass DV DDO to DGNDO with a 0.1µF capacitor.
18 15 DV DD
Digital-Supply Voltage Input. Connect DV
DD
to a +4.75V to +5.25V power-supply voltage.
Bypass DV DD to DGND with a 0.1µF capacitor.
19 16 REFCAP
Bandgap-Voltage Bypass Node. For external reference operation, connect REFCAP to AV DD .
For internal reference operation, bypass REFCAP with a 0.01µF capacitor to AGND1
(V
REFCAP
≈ 4.096V).
20 17 REF
Reference-Buffer Output/ADC Reference Input. For external reference operation, apply an
external reference voltage from 3.800V to 4.136V to REF. For internal reference operation,
bypassing REF with a 1µF capacitor to AGND1 sets V
REF = 4.096V ±1%.