MAX144 Maxim, MAX144 Datasheet - Page 6

• Manufacturer Part Number: MAX144
• Description: +2.7V / Low-Power / 2-Channel / 108ksps / Serial 12-Bit ADCs in 8-Pin MAX
• Manufacturer: Maxim

+2.7V, Low-Power, 2-Channel, 108ksps,
Serial 12-Bit ADCs in 8-Pin µMAX
(V
unless otherwise noted.)
6
DD
PIN
_______________________________________________________________________________________
1
2
3
4
5
6
7
8
-0.05
-0.10
-0.15
-0.20
0.20
0.15
0.10
0.05
= +3.0V, V
0
0
CH0 (CH+)
CH1 (CH-)
CS/SHDN
NAME
DOUT
SCLK
INTEGRAL NONLINEARITY
GND
1024
V
REF
REF
DD
vs. OUTPUT CODE
-100
-120
-140
-20
-40
-60
-80
= 2.5V, 0.1µF at REF, f
OUTPUT CODE
20
0
2048
0
Positive Supply Voltage, +2.7V to +5.25V
Analog Input: MAX144 = single-ended (CH0); MAX145 = differential (CH+)
Analog Input: MAX144 = single-ended (CH1); MAX145 = differential (CH-)
Analog and Digital Ground
External Reference Voltage Input. Sets the analog voltage range. Bypass with a 100nF capacitor close to
the device.
Active-Low Chip-Select Input/Active-High Shutdown Input. Pulling CS/SHDN high puts the device into
shutdown with a maximum current of 5µA.
Serial Data Output. Data changes state at SCLK’s falling edge. High impedance when CS/SHDN
is high.
Serial Clock Input. DOUT changes on the falling edge of SCLK.
3072
FREQUENCY (kHz)
FFT PLOT
4096
27
V
f
f
SCLK
IN
SAMPLE
DD
= 10kHz
= +2.7V
= 108ksps
= 2.17MHz, 16 clocks/conversion cycle (108ksps), CH- = GND for MAX145, T
Typical Operating Characteristics (continued)
0.5
0.4
0.3
0.2
0.1
0
2.5
54
3.0
INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE
3.5
V
DD
4.0
(V)
FUNCTION
4.5
12.0
11.8
11.6
11.4
11.2
11.0
5.0
1
5.5
V
DD
EFFECTIVE NUMBER OF BITS
= +2.7V
vs. FREQUENCY
FREQUENCY (kHz)
0.5
0.4
0.3
0.2
0.1
0
-60
10
-35
INTEGRAL NONLINEARITY
Pin Description
-10
vs. TEMPERATURE
TEMPERATURE (°C)
15
40
100
65
A
90
= +25°C,
115 140