Typical operating characteristics (continued), Pin description – Rainbow Electronics MAX1109 User Manual
Page 9
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
_______________________________________________________________________________________
9
0.5
-0.5
0
300
INTEGRAL NONLINEARITY
vs. CODE
-0.1
0
-0.3
-0.4
-0.2
0.4
0.3
MAX1108/09-13
DIGITAL CODE
INL (LSB)
50
100
150
200
250
0.1
0.2
20
-100
0
30
FFT PLOT
-60
-80
0
MAX1108/09-14
FREQUENCY (kHz)
AMPLITUDE (dB)
5
10
15
20
25
-20
-40
f
CH_
= 9997Hz, 2Vp-p
f
SAMPLE
= 53.25kHz
21.0
18.0
0
6
CONVERSION TIME vs. SUPPLY VOLTAGE
19.0
18.5
20.5
MAX1108/09-15
SUPPLY VOLTAGE (V)
CONVERSION TIME(
µ
s)
1
2
3
4
5
20.0
19.5
INTERNAL CONVERSION MODE
Typical Operating Characteristics (continued)
(V
DD
= +3.0V (MAX1108), V
DD
= +5.0V (MAX1109); external conversion mode; f
SCLK
= 500kHz; 50ksps; external reference; 1µF at
REF; T
A
= +25°C; unless otherwise noted.)
Pin Description
Sampling Analog Inputs
CH0, CH1
2, 3
Reference voltage for analog-to-digital conversion (internal or external reference). Reference input for
external reference. Bypass internal reference with 1µF capacitor to GND.
REF
5
Ground
GND
4
Active-Low Chip Select. Data is not clocked into DIN unless CS is low. When CS is high, DOUT is high
impedance.
CS
7
Serial Data Output. Data is clocked out on the falling edge of SCLK. High impedance when CS is high.
DOUT
9
Serial Data Input. Data is clocked in at the rising edge of SCLK.
DIN
8
Common reference for analog inputs. Sets zero-code voltage in single-ended mode. Must be stable to
±0.5LSB during conversion.
COM
6
Serial Clock Input. Clocks data in and out of serial interface. In external clock mode, SCLK also sets the
conversion speed.
SCLK
10
PIN
Positive Supply Voltage
V
DD
1
FUNCTION
NAME
25
15
-40
100
CONVERSION TIME vs. TEMPERATURE
18
17
16
24
23
MAX1108/09-16
TEMPERATURE (°C)
CONVERSION TIME (
µ
s)
-20
0
20
40
60
80
22
21
20
19
INTERNAL CONVERSION MODE
V
DD
= 3V
V
DD
= 5V
1.0010
0.9980
-40
100
NORMALIZED REFERENCE VOLTAGE
vs. TEMPERATURE
0.9990
0.9985
1.0005
MAX1108/09-17
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
-20
0
20
40
60
80
1.0000
0.9995
0
-100
0
25
CHANNEL-TO-CHANNEL
CROSSTALK vs. FREQUENCY
-70
-80
-90
-10
-20
MAX1108/09-18
FREQUENCY (kHz)
CROSSTALK (dB)
5
10
15
20
-30
-40
-50
-60
V
CH_OFF
= V
REFp-p