AD7827 Analog Devices, AD7827 Datasheet - Page 4

• Manufacturer Part Number: AD7827
• Description: 3/5V, 1 MSPS, 8-Bit, Serial Interface Sampling ADC
• Manufacturer: Analog Devices

Specifications of AD7827

• Resolution (bits): 8bit
• # Chan: 1
• Sample Rate: 1MSPS
• Interface: Ser
• Analog Input Type: SE-Uni
• Ain Range: Uni 2.0V,Uni 2.5V
• Adc Architecture: Pipelined
• Pkg Type: DIP,SOIC

AD7827
ABSOLUTE MAXIMUM RATINGS*
V
Digital Input Voltage to GND
Digital Output Voltage to GND
V
Analog Input Voltage to AGND . . . . . . –0.3 V, V
Operating Temperature Range
Storage Temperature Range . . . . . . . . . . . . –65 C to +150 C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . +300 C
Plastic DIP Package, Power Dissipation . . . . . . . . . . 450 mW
SOIC Package, Power Dissipation . . . . . . . . . . . . . . . 450 mW
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0 kV
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
Model
AD7827BN
AD7827BR
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 AD7827 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.
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.
DD
REF
(CONVST, SCLK) . . . . . . . . . . . . . . –0.3 V, V
(D
Industrial (B Version) . . . . . . . . . . . . . . . –40 C to +105 C
Lead Temperature, (Soldering 10 sec) . . . . . . . . . . +260 C
Lead Temperature, Soldering
JA
JA
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . +215 C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . +220 C
to GND . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
OUT
to GND . . . . . . . . . . . . . . . . . . . . . . –0.3 V, V
Thermal Impedance . . . . . . . . . . . . . . . . . . . +105 C/W
Thermal Impedance . . . . . . . . . . . . . . . . . . . . +75 C/W
, RFS) . . . . . . . . . . . . . . . . . . . –0.3 V, V
Linearity
Error
(LSB)
0.5 LSB
0.5 LSB
ORDERING GUIDE
Package
Description
Plastic DIP
Small Outline IC
DD
DD
DD
DD
Package
Option
N-8
SO-8
+ 0.3 V
+ 0.3 V
+ 0.3 V
+ 0.3 V
–4–
Pin No.
1
2
3
4
5
6
7
8
Mnemonic
CONVST
V
RFS
GND
V
D
SCLK
V
IN
REF
DD
OUT
PIN FUNCTION DESCRIPTIONS
CONVST
PIN CONFIGURATION
GND
RFS
V
IN
Description
Convert Start. Puts the track-and-
hold into hold mode and initiates a
conversion.
The state of this pin at the end of
conversion also determines whether
or not the part is powered down.
Analog Input is applied here.
Receive Frame Sync. This is an
output. When this signal goes logic
high at the end of a conversion, the
DSP starts latching in data on the
next cycle of SCLK.
Ground reference for analog and
digital circuitry.
Reference Input.
Serial Data is shifted out on this pin.
Data is clocked out by the rising
edges of SCLK.
Serial Clock. An external serial clock
is applied here. The clock must be
continuous so the RFS (frame SYNC)
can be synchronized to the clock for
high speed data transfers. (See
Microprocessor Interfacing section.)
Positive Supply Voltage 3 V/5 V
1
2
3
4
(Not to Scale)
TOP VIEW
AD7827
WARNING!
8
7
6
5
V
SCLK
D
V
DD
OUT
REF
ESD SENSITIVE DEVICE
REV. 0
10%.