REV. D
AD9057
–4–
CAUTION
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 AD9057 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
ABSOLUTE MAXIMUM RATINGS*
V
D
, V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Analog Inputs . . . . . . . . . . . . . . . . . . . . –0.5 V to V
D
+ 0.5 V
Digital Inputs . . . . . . . . . . . . . . . . . . . –0.5 V to V
DD
+ 0.5 V
VREF Input . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
D
+ 0.5 V
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Operating Temperature . . . . . . . . . . . . . . . . –55∞C to +125∞C
Storage Temperature . . . . . . . . . . . . . . . . . . –65∞C to +150∞C
Maximum Junction Temperature . . . . . . . . . . . . . . . . 150∞C
Maximum Case Temperature . . . . . . . . . . . . . . . . . . . 150∞C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
ORDERING GUIDE
Temperature
Model Range Package Option*
AD9057BRS-40 –40∞C to +85∞C RS-20
AD9057BRS-60 –40∞C to +85∞C RS-20
AD9057BRS-80 –40∞C to +85∞C RS-20
AD9057/PCB 25∞CEvaluation Board
*RS = Shrink Small Outline Package (SSOP).
Table I. Digital Coding (VREF = 2.5 V)
Analog Input Voltage Level Digital Output
3.0 V Positive Full Scale 1111 1111
2.502 V Midscale +1/2 LSB 1000 0000
2.498 V Midscale –1/2 LSB 0111 1111
2.0 V Negative Full Scale 0000 0000
PIN FUNCTION DESCRIPTIONS
Pin No. Mnemonic Function
1 PWRDN Power-Down Function Select;
Logic High for Power-Down
Mode (Digital Outputs Go to
High Impedance State).
2 VREF OUT Internal Reference Output
(2.5 V typ); Bypass with 0.1 mF
to Ground.
3 VREF IN Reference Input for ADC (2.5 V
typ, ± 10%).
4, 9, 16 GND Ground (Analog/Digital).
5, 8 V
D
Analog 5 V Power Supply.
6 BIAS OUT Bias Pin for AC Coupling
(1 kW to REF IN).
7 AIN Analog Input for ADC.
10 ENCODE Encode Clock for ADC (ADC
Samples on Rising Edge of
Encode).
11–14, 17–20 D7–D0 Digital Outputs of ADC.
15 V
DD
Digital Output Power Supply;
Nominally 3 V to 5
V.
PIN CONFIGURATION
14
13
12
11
17
16
15
20
19
18
10
9
8
1
2
3
4
7
6
5
TOP VIEW
(Not to Scale)
PWRDN
D3
D2
D1
D0 (LSB)
VREF OUT
VREF IN
GND
AD9057
D4
V
DD
GND
V
D
BIAS OUT
AIN
V
D
GND
ENCODE
D7 (MSB)
D6
D5
