MAX1220 Datasheet, PDF (16/47 Pages) Maxim Integrated Products – 12-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports

12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
PIN
MAX1220
MAX1257
MAX1258
1, 2
—
3
4
4
7
5
8
6
9
7
8
9–12, 16–19
13
14
15, 23, 32, 33
20
21
10
11
12–15,
22–25
18
19
—
26
27
22
28
24, 25
—
Pin Description
NAME
FUNCTION
GPIOA0, GPIOA1 General-Purpose I/O A0, A1. GPIOA0, A1 can sink and source 15mA.
EOC
DV_DD
DGND
Active-Low End-of-Conversion Output. Data is valid after the falling edge of
EOC.
Digital Positive-Power Input. Bypass DV_DD to DGND with a 0.1µF
Digital Ground. Connect DGND to AGND.
DOUT
Serial-Data Output. Data is clocked out on the falling edge of the SCLK
clock in modes 00, 01, and 10. Data is clocked out on the rising edge of
the SCLK clock in mode 11. It is high impedance when CS is high.
SCLK
Serial-Clock Input. Clocks data in and out of the serial interface. (Duty
cycle must be 40% to 60%.) See Table 5 for details on programming the
clock mode.
DIN
Serial-Data Input. DIN data is latched into the serial interface on the falling
edge of SCLK.
OUT0–OUT7 DAC Outputs
AV_DD
AGND
N.C.
Positive Analog Power Input. Bypass AV_DD to AGND with a 0.1µF
Analog Ground
No Connection. Not internally connected.
LDAC
Active-Low Load DAC. LDAC is an asynchronous active-low input that
updates the DAC outputs. Drive LDAC low to make the DAC registers
transparent.
CS
Active-Low Chip-Select Input. When CS is low, the serial interface is
enabled. When CS is high, DOUT is high impedance.
RES_SEL
Reset Select. Select DAC wake-up mode. Set RES_SEL low to wake up the
DAC outputs with a 100kΩ resistor to GND or set RES_SEL high to wake
up the DAC outputs with a 100kΩ resistor to V_REF. Set RES_SEL high to
power up the DAC input register to FFFh. Set RES_SEL low to power up the
DAC input register to 000h.
GPIOC0, GPIOC1 General-Purpose I/O C0, C1. GPIOC0, C1 can sink 4mA and source 2mA.
16 ______________________________________________________________________________________