AD7892AR-1 ,LC2MOS Single Supply, 12-Bit 600 kSPS ADCGENERAL DESCRIPTION The AD7892 is fabricated in Analog Devices’ Linear Compat-2The AD7892 is a high ..
AD7892AR-2 ,LC2MOS Single Supply, 12-Bit 600 kSPS ADCspecifications T to TDD MIN MAXAD7892–
AD7892AR-2 ,LC2MOS Single Supply, 12-Bit 600 kSPS ADCSPECIFICATIONS unless otherwise noted.)1 2Parameter A Versions B Versions S Version Unit Test Condi ..
AD7892AR-3 ,LC2MOS Single Supply, 12-Bit 600 kSPS ADCspecifications T to TDD MIN MAXAD7892–
AD7892BN-1 ,LC2MOS Single Supply, 12-Bit 600 kSPS ADCspecifications such as processors.linearity, full-scale and offset errors, the part is also specifi ..
AD7892BN-3 ,LC2MOS Single Supply, 12-Bit 600 kSPS ADCFEATURES FUNCTIONAL BLOCK DIAGRAMFast 12-Bit ADC with 1.47s Conversion TimeREF OUT/REF IN VDD600 k ..
ADM485JN ,+5 V Low Power EIA RS-485 TransceiverSPECIFICATIONS CC MIN MAXParameter Min Typ Max Units Test Conditions/CommentsDRIVERPropagation Dela ..
ADM485-JN ,+5 V Low Power EIA RS-485 TransceiverSPECIFICATIONSParameter Min Typ Max Units Test Conditions/CommentsDRIVERDifferential Output Voltage ..
ADM485JR ,+5 V Low Power EIA RS-485 TransceiverSpecifications subject to change without notice.–2–REV. AADM485ABSOLUTE MAXIMUM RATINGS*PIN FUNCTIO ..
ADM485JR. ,+5 V Low Power EIA RS-485 TransceiverSPECIFICATIONS CC MIN MAXParameter Min Typ Max Units Test Conditions/CommentsDRIVERPropagation Dela ..
ADM487EARZ-REEL7 , 5 V, ±15 kV ESD Protected Half-Duplex, RS-485/RS-422 Transceivers
ADM487EARZ-REEL7 , 5 V, ±15 kV ESD Protected Half-Duplex, RS-485/RS-422 Transceivers
AD7892AN-1-AD7892AN-2-AD7892AN-3-AD7892AR-1-AD7892AR-2-AD7892AR-3-AD7892BN-1-AD7892BN-3-AD7892BR-1-AD7892BR-2-AD7892SQ/1-AD7892SQ-1
LC2MOS Single Supply, 12-Bit 600 kSPS ADC
a
LC2MOS Single Supply,12-Bit 600 kSPS ADC
FUNCTIONAL BLOCK DIAGRAMThe AD7892 is fabricated in Analog Devices’ Linear Compat-
ible CMOS (LC2MOS) process, a mixed technology process
that combines precision bipolar circuits with low power CMOS
logic. It is available in a 24-lead, 0.3" wide, plastic or hermetic
DIP or in a 24-lead SOIC.
PRODUCT HIGHLIGHTS1. The AD7892-3 features a conversion time of 1.47µs and a
track/hold acquisition time of 200ns. This allows a through-
put rate for the part up to 600kSPS. The AD7892-1 and
AD7892-2 operate with throughput rates of 500kSPS.
2. The AD7892 operates from a single +5V supply and con-
sumes 60mW typ making it ideal for low power and portable
applications.
3. The part offers a high speed, flexible interface arrangement
with parallel and serial interfaces for easy connection to
microprocessors, microcontrollers and digital signal
processors.
GENERAL DESCRIPTIONThe AD7892 is a high speed, low power, 12-bit A/D converter
that operates from a single +5V supply. The part contains a
1.47µs successive approximation ADC, an on-chip track/hold
amplifier, an internal +2.5V reference and on-chip versatile
interface structures that allow both serial and parallel connec-
tion toamicroprocessor. The part accepts an analog input range
of ±10V or ±5V (AD7892-1), 0 V to +2.5V (AD7892-2) and2.5V (AD7892-3). Overvoltage protection on the analog inputs
for the AD7892-1 and AD7892-3 allows the input voltage to go
to ±17 V or ±7 V respectively without damaging the ports.
The AD7892 offers a choice of two data output formats: a
single, parallel, 12-bit word or serial data. Fast bus access times
and standard control inputs ensure easy parallel interface to
microprocessors and digital signal processors. A high speed
serial interface allows direct connection to the serial ports of
microcontrollers and digital signal processors.
In addition to the traditional dc accuracy specifications such as
linearity, full-scale and offset errors, the part is also specified for
dynamic performance parameters including harmonic distortion
and signal-to-noise ratio.
REV. C
FEATURES
Fast 12-Bit ADC with 1.47�s Conversion Time
600 kSPS Throughput Rate (AD7892-3)
500 kSPS Throughput Rate (AD7892-1, AD7892-2)
Single Supply Operation
On-Chip Track/Hold Amplifier
Selection of Input Ranges:�10 V or �5 V for AD7892-1
0 V to +2.5 V for AD7892-2�2.5 V for AD7892-3
High Speed Serial and Parallel Interface
Low Power, 60 mW typ
Overvoltage Protection on Analog Inputs (AD7892-1
and AD7892-3)
(VDD = +5 V � 5%, AGND = DGND = 0 V, REF IN = +2.5 V. All specifications TMIN to TMAX
unless otherwise noted.)AD7892–SPECIFICATIONSDYNAMIC PERFORMANCE
ANALOG INPUT
ABSOLUTE MAXIMUM RATINGS*(TA = +25°C unless otherwise noted)
VDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +7V
VDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +7V
Analog Input Voltage to AGND
AD7892-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±17V
AD7892-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V, VDD
AD7892-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±7 V
Reference Input Voltage to AGND . . . –0.3 V to VDD + 0.3V
Digital Input Voltage to DGND . . . . . –0.3 V to VDD + 0.3 V
Digital Output Voltage to DGND . . . . –0.3 V to VDD + 0.3 V
Operating Temperature Range
Commercial (A, B Versions) . . . . . . . . . . . –40°C to +85°C
Extended (S Version) . . . . . . . . . . . . . . . . –55°C to +125°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
LOGIC OUTPUTS
POWER REQUIREMENTS
NOTESTemperature ranges are as follows: A, B Versions: –40°C to +85°C; S Version: –55°C to +125°C.S Version available on AD7892-1 and AD7892-2 only.See Terminology.Sample tested @ +25°C to ensure compliance.These normal mode and standby mode currents are achieved with resistors (in the range 10kΩ to 100kΩ) to either DGND or VDD on Pins 8, 9, 16 and 17.A conversion should not be initiated on the part within 30µs of exiting standby mode.
Specifications subject to change without notice.
AD7892Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Plastic DIP Package, Power Dissipation . . . . . . . . . . 450 mW
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 105°C/W
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . +260°C
Cerdip Package, Power Dissipation . . . . . . . . . . . . . . 450 mW
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 70°C/W
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . +300°C
SOIC Package, Power Dissipation . . . . . . . . . . . . . . . 450 mW
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 75°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . +220°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.
AD7892
TIMING CHARACTERISTICS1, 2tACQ
Parallel Interface
t13
t14
t15
t16
t17A
NOTESSample tested at +25°C to ensure compliance. All input signals are measured with tr = tf = 1 ns (10% to 90% of +5 V) and timed from a voltage level of +1.6V.See Figures 2 and 3.Measured with the load circuit of Figure 1 and defined as the time required for an output to cross 0.8V or 2.4V.These times are derived from the measured time taken by the data outputs to change 0.5V when loaded with the circuit of Figure 1. The measured number is then
extrapolated back to remove the effects of charging or discharging the 50 pF capacitor. This means that the times quoted in the timing characteristics are the true bus
relinquish times of the part and as such are independent of external bus loading capacitances.Assumes CMOS loads on the data bits. With TTL loads, more current is drawn from the data lines and the RD to CONVST time needs to be extended to 400ns min.
Specifications subject to change without notice.
Figure 1.Load Circuit for Access Time and Bus Relinquish Time
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD7892 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
(VDD = +5V � 5%, AGND = DGND = 0V, REF IN = +2.5V)
ORDERING GUIDEEVAL-AD7892-3CB
NOTESN = Plastic DIP; Q = Cerdip; R = SOIC.These boards can be used as stand-alone evaluation boards or in conjunction with the EVAL-CONTROL BOARD for evaluation/demonstration purposes.This board is a complete unit allowing a PC to control and communicate with all Analog Devices’ evaluation boards ending in the CB designators.
AD7892
PIN FUNCTION DESCRIPTION
PIN CONFIGURATION
DIP and SOIC
