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PDF AD7993 Data sheet ( Hoja de datos )
| Número de pieza | AD7993 | |
| Descripción | 4-Channel/ 12-/10-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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PRELIMINARYTECHNICAL DATA
a 4-Channel,12-/10-BitADCswithI2CCompatible
Interface in 16-Lead TSSOP
Preliminary Technical Data
AD7994/AD7993
FEATURES
FUNCTIONAL BLOCK DIAGRAM
12-Bit ADC with Fast Conversion Time: 2 µs
Four Single-Ended Analog Input Channels
Specified for VDD of 2.7 V to 5.5 V
Low Power Consumption
Fast Throughput Rate:- 188 KSPS
Sequencer Operation
Automatic Cycle Mode
I2CR Compatible Serial Interface
I2CR Interface supports:
VDD
GND REFIN
AD7994/AD7993
VIN1
VIN2
VIN3
VIN4
I/P
MUX
T/H
12-/10-BIT
SUCCESSIVE
APPROXIMATION
ADC
CONVST
CONTROL
LOGIC
OSCILLATOR
Standard, Fast, and High-Speed Modes
Out of Range Indicator/Alert Function
Pin-Selectable Addressing via AS
Two Versions Allow Five I2C Addresses
Shutdown Mode: 1µA max
16-Lead TSSOP Package
DATALOW LIMIT
REGISTER CH1-CH4
DATAHIGH LIMIT
REGISTER CH1-CH4
CONVERSION
RESULT REGISTER
CONFIGURATION
REGISTER
ALERT STATUS
REGISTER
ALERT
GENERAL DESCRIPTION
The AD7994/AD7993 are 4 channel, 12-/10-bit, high
speed, low power, successive-approximation ADCs re-
spectively. They operate from a single 2.7 V to 5.5 V
AS
HYSTERESIS
REGISTER CH1-CH4
CYCLE TIMER
REGISTER
I2C INTERFACE
SCL
SDA
power supply and feature a conversion time of 2 µs. The
GND
parts contain a four channel multiplexer and track/hold
amplifier which can handle input frequencies in excess of
TBD kHz.
The AD7994/AD7993 provide a two-wire serial interface
which is compatible with I2C interfaces. The parts come
in two versions, AD7994-0/AD7993-0 to AD7994-1/
On-chip registers can be programmed with high and low
limits for the conversion result, and an open drain Out of
Range Indicator output (ALERT), becomes active when
the programmed high or low limits are violated by the
conversion result. This output can be used as an interrupt.
AD7993-1. Each version allows for a minimum of two
different I2C addresses. The I2C interface on the AD7994-
0/AD7993-0 supports Standard and Fast I2C Interface
Modes. The I2C interface on the AD7994-1/AD7993-1
supports Standard, Fast and two High-Speed I2C Interface
Modes.
The AD7994/AD7993 normally remain in a shutdown
state while not converting, powering up only for conver-
sions. The conversion process can be controlled using the
CONVST pin, an Automatic Conversion Cycle selected
PRODUCT HIGHLIGHTS
1. 2 µs Conversion time with low power consumption.
2. I2C Compatible Serial Interface with pin selectable
addresses. Two AD7994/AD7993 versions allow five
AD7994/AD7993 devices to be connected to the same
serial bus.
3. The parts feature automatic shutdown while not convert-
ing to maximize power efficiency. Current consumption
is 1µA max when in shutdown.
through software control, or a mode where conversions
4. Reference can be driven up to the power supply.
occur across Write operations. There are no pipeline de-
lays associated with the part.
5. Out of Range Indicator which can be software disabled/
enabled.
The reference for the part is applied externally to the
REFIN pin and can be in the range of 1.2V to VDD. This
allows the widest dynamic input range to the ADC.
6. Oneshot and automatic conversion rates.
7. No Pipeline Delay
The part features a standard successive-approximation
ADC.
SMBus is a trademark and I2C is a registered trademark of Philips Corporation
REV. PrF 09/03
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2003
1 page  
PRELIMINARYTECHNICAL DATA
AD7993–SPECIFICATIONS1(VDD = +2.7 V to +5.5 V, unless otherwise noted ; REFIN = 2.5 V; fSCL = 3.4 MHz unless
otherwise noted; TA = TMIN to TMAX, unless otherwise noted.)
Parameter
CONVERSION RATE
Conversion Time
Track/Hold Acquisition Time
Throughput Rate
POWER REQUIREMENTS
VDD
IDD
Peak Current
Power Down Mode , Interface Inactive
Interface Active
B Version1
2
TBD
TBD
3.4
13
79
2.7/5.5 V
TBD
0.2/0.6
0.05/0.2
0.3/0.8
Units
µs typ
ns max
ns max
KSPS max
KSPS max
KSPS max
min/max
mA max
µA max
mA max
mA max
Test Conditions/Comments
See Interface Section
Full-Scale step input
Sine wave input <= 30 KHz
Standard mode 100 kHz
Fast Mode 400 kHz
High-Speed Mode 3.4 MHz
Digital Inputs = 0 V or VDD
Peak Current during conversion
VDD = 3 V/5 V.
VDD = 3 V/5 V 400 kHz SCL.
VDD = 3 V/5 V 3.4 MHz SCL.
Operating, Interface Inactive
Interface Active
0.06/0.15
0.3/0.6
0.15/0.35
0.6/1.4
NOTES
1Temperature ranges as follows: B Version: –40°C to +85°C.
2See Terminology.
3Sample tested @ +25°C to ensure compliance.
4See POWER VERSUS THROUGHPUT RATE section.
Specifications subject to change without notice.
t11
t2
t12
mA max
mA max
mA max
mA max
t6
VDD = 3 V/5 V 400 kHz SCL.
VDD = 3 V/5 V 3.4 MHz SCL.
VDD = 3 V/5 V 400 kHz SCL.
VDD = 3 V/5 V 3.4 MHz SCL.
SCL
t6
SDA
t7
PS
t4 t3
t1
t5
t10
S
t8
t9
P
S = START CONDITION
P = STOP CONDITION
Figure 1. Two-Wire Serial Interface Timing Diagram
I C TIMING SPECIFICATIONS2 1 (VDD = +2.7 V to +5.5 V, unless otherwise noted ; REFIN = 2.5 V; unless otherwise noted; TA =
TMIN to TMAX, unless otherwise noted..)
Parameter Conditions
AD7994/AD7993
Limit at TMIN, TMAX
MIN
MAX Unit Description
fSCL 2
t1
t2
t3
Standard Mode
Fast Mode
High-Speed Mode, CB = 100pF max
High-Speed Mode, CB = 400pF max
Standard Mode
4
Fast Mode
0.6
High-Speed Mode, CB = 100pF max 60
High-Speed Mode, CB = 400pF max 120
Standard Mode
4.7
Fast Mode
1.3
High-Speed Mode, CB = 100pF max 160
High-Speed Mode, CB = 400pF max 320
Standard Mode
250
Fast Mode
100
High-Speed Mode
10
100 kHz Serial Clock Frequency
400 kHz
3.4 MHz
1.7 MHz
µs tHIGH, SCL High Time
µs
ns
ns
µs tLOW, SCL Low Time
µs
ns
ns
- ns tSU;DAT, Data Setup Time
- ns
- ns
REV. PrF
–5–
5 Page 
PRELIMINARYTECHNICAL DATA
AD7994/AD7993
AD7994/AD7993 TYPICAL PERFORMANCE CURVES
TPC 1 shows a typical FFT plot for the AD7994 at TBD
kSPS sample rate and TBD kHz input frequency.
TPC 1. AD7994 Dynamic Perfor-
mance at TBD ksps.
TPC 2. AD7993 Dynamic Perfor-
mance at TBD ksps.
TPC 3. PSRR vs Supply Ripple Fre-
quency.
TPC 4. AD7994 SINAD vs Analog
Input Frequency for Various Sup-
ply Voltages at TBD ksps.
TPC 5. AD7994 Typical INL VDD =
5V.
TPC 6. AD7994 Typical DNL VDD =
5V.
TPC 7. AD7994 Typical INL VDD =
3V.
TPC 8. AD7994 Typical DNL VDD =
3V.
TPC 9. AD7994 Change in INLvs
Reference Voltage VDD = 5V.
REV. PrF
–11–
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet AD7993.PDF ] | |
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