MAX11661 Datasheet, PDF (18/28 Pages) Maxim Integrated Products – 500ksps, Low-Power, Serial 12-/10-/8-Bit ADCs

500ksps, Low-Power,
Serial 12-/10-/8-Bit ADCs
TOP VIEW
AIN1 1 ⁺
10 SCLK
AIN2 2
AGND 3
REF 4
MAX11662
MAX11664
MAX11666
9 DOUT
8 OVDD
7 CHSEL
VDD 5
EP* ^{6 CS}
µMAX
Pin Configurations
TOP VIEW
VDD 1 ⁺
6 CS
MAX11661
GND 2 MAX11663 5 DOUT
MAX11665
AIN 3
4 SCLK
SOT23
*CONNECT EP TO GROUND PLANE. DEVICES DO NOT OPERATE WHEN EP IS NOT CONNECTED TO GROUND!
Pin Description
PIN
µMAX SOT23
1
—
2
—
—
3
—
2
3
—
4
—
5
1
6
6
7
—
8
—
9
5
10
4
EP
—
NAME
AIN1
AIN2
AIN
GND
AGND
REF
VDD
CS
CHSEL
OVDD
DOUT
SCLK
GND
FUNCTION
Analog Input Channel 1. Single-ended analog input with respect to AGND with range of 0V to
VREF.
Analog Input Channel 2. Single-ended analog input with respect to AGND with range of 0V to
V_REF.
Analog Input Channel. Single-ended analog input with respect to GND with range of 0V to VDD.
Ground. Connect GND to the GND ground plane.
Analog Ground. Connect AGND directly the GND ground plane.
External Reference Input. REF defines the signal range of the input signal AIN1/AIN2: 0V to VREF.
The range of V_REF is 1V to V_DD. Bypass REF to AGND with 10FF || 0.1FF capacitor.
Positive Supply Voltage. Bypass VDD with a 10FF || 0.1FF capacitor to GND. VDD range is 2.2V
to 3.6V. For the SOT23 package, V_DD also defines the signal range of the input signal AIN: 0V to
V_DD.
Active-Low Chip-Select Input. The falling edge of CS samples the analog input signal, starts a
conversion, and frames the serial-data transfer.
Channel Select. Set CHSEL high to select AIN2 for conversion. Set CHSEL low to select AIN1 for
conversion.
Digital Interface Supply for SCLK, CS, DOUT, and CHSEL. The OVDD range is 1.5V to V_DD.
Bypass OVDD with a 10FF || 0.1FF capacitor to GND.
Three-State Serial-Data Output. ADC conversion results are clocked out on the falling edge of
SCLK, MSB first. See Figure 1.
Serial-Clock Input. SCLK drives the conversion process. DOUT is updated on the falling edge of
SCLK. See Figures 2 and 3.
Exposed Pad. Connect EP directly to a solid ground plane. Devices do not operate when EP is
not connected to ground!
18   �������������������������������������������������������������������������������������