MAX144_05 Datasheet, PDF (6/16 Pages) Maxim Integrated Products – +2.7V, Low-Power, 2-Channel, 108ksps, Serial 12-Bit ADCs in 8-Pin μMAX

+2.7V, Low-Power, 2-Channel, 108ksps,
Serial 12-Bit ADCs in 8-Pin µMAX
Typical Operating Characteristics (continued)
(V_DD = +3.0V, V_REF = 2.5V, 0.1µF at REF, f_SCLK = 2.17MHz, 16 clocks/conversion cycle (108ksps), CH- = GND for MAX145, T_A = +25°C,
unless otherwise noted.)
0.20
0.15
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
0
INTEGRAL NONLINEARITY
vs. OUTPUT CODE
1024 2048 3072 4096
OUTPUT CODE
INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE
0.5
0.4
0.3
0.2
0.1
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_DD (V)
INTEGRAL NONLINEARITY
vs. TEMPERATURE
0.5
0.4
0.3
0.2
0.1
0
-60 -35 -10 15 40 65 90 115 140
TEMPERATURE (°C)
20
0
-20
-40
-60
-80
-100
-120
-140
0
FFT PLOT
V_DD = +2.7V
f_IN = 10kHz
f_SAMPLE = 108ksps
27
54
FREQUENCY (kHz)
EFFECTIVE NUMBER OF BITS
vs. FREQUENCY
12.0
V_DD = +2.7V
11.8
11.6
11.4
11.2
11.0
1
10
100
FREQUENCY (kHz)
Pin Description
PIN
NAME
FUNCTION
1
V_DD
Positive Supply Voltage, +2.7V to +5.25V
2
CH0 (CH+) Analog Input: MAX144 = single-ended (CH0); MAX145 = differential (CH+)
3
CH1 (CH-) Analog Input: MAX144 = single-ended (CH1); MAX145 = differential (CH-)
4
GND
Analog and Digital Ground
5
REF
External Reference Voltage Input. Sets the analog voltage range. Bypass with a 100nF capacitor close to
the device.
6
CS/SHDN
Active-Low Chip-Select Input/Active-High Shutdown Input. Pulling CS/SHDN high puts the device into
shutdown with a maximum current of 5µA.
7
DOUT
Serial Data Output. Data changes state at SCLK’s falling edge. High impedance when CS/SHDN
is high.
8
SCLK
Serial Clock Input. DOUT changes on the falling edge of SCLK.
6 _______________________________________________________________________________________