AD9050
–4–
REV. B
T able I. AD9050 Digital Coding (Single E nded Input AIN, AINB Bypassed to GND)
OR
(Out of Range)
Digital Output
MSB . . . LSB
Analog Input
Voltage Level
3.813
3.300
2.787
Positive Full Scale + 1 LSB
Midscale
Negative Full Scale – 1 LSB
1
0
1
1111111111
0111111111
0000000000
PIN FUNCT ION DE SCRIPT IONS
Pin No
Name
Function
1, 7, 12, 21, 23
2, 8, 11
3
4
5
6
9
10
13
GND
V
D
VREF
OUT
VREF
IN
COMP
REF
BP
AINB
AIN
ENCODE
Ground.
Analog +5 V
±
5% power supply.
Internal bandgap voltage reference (nominally +2.5 V).
Input to reference amplifier. Voltage reference for ADC is connected here.
Internal compensation pin, 0.1
μ
F bypass connected here to V
D
(+5 V).
External connection for (0.1
μ
F) reference bypass capacitor.
Complementary analog input pin (Analog input bar).
Analog input pin.
Encode clock input to ADC. Internal T /H is placed in hold mode (ADC is encoding)
on rising edge of encode signal.
Out of range signal. Logic “0” when analog input is in nominal range. Logic “1” when
analog input is out of nominal range.
Most significant bit of ADC output.
Digital output bits of ADC.
Digital output power supply (only used by digital outputs).
Digital output bits of ADC.
Least significant bit of ADC output.
14
OR
15
16–19
20, 22
24–27
28
D9 (MSB)
D8–D5
V
DD
D4–D1
D0 (LSB)
PIN CONFIGURAT ION
14
13
12
11
10
9
8
1
2
3
4
7
6
5
17
16
15
20
19
18
28
27
26
25
24
23
22
21
TOP VIEW
(Not to Scale)
AD9050
GND
D3
D2
D1
D0 (LSB)
V
D
VREF
OUT
VREF
IN
COMP
V
DD
GND
D4
REF
BP
GND
V
D
AINB
AIN
D5
V
DD
GND
V
D
GND
ENCODE
OR
D6
D9 (MSB)
D8
D7
WARNING!
ESD SENSITIVE DEVICE
C AUT ION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD9050 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. T herefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.