Texas Instruments ADS850 Handleiding
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FEATURES
●SELF-CALIBRATING
●HIGH SFDR: 85dB at NYQUIST
●HIGH SNR: 76dB
●LOW POWER: 250mW
●
DIFFERENTIAL OR SINGLE-ENDED INPUTS
●
+3V/+5V LOGIC I/O COMPATIBLE
●FLEXIBLE INPUT RANGE
●OVER-RANGE INDICATOR
●INTERNAL OR EXTERNAL REFERENCE
APPLICATIONS
●IF AND BASEBAND DIGITIZATION
●CCD IMAGING SCANNERS
●TEST INSTRUMENTATION
●IR IMAGING
DESCRIPTION
The ADS850 is a high dynamic range, 14-bit Analog-to-Digital
Converter (ADC) that utilizes a fully differential input, allowing for
either single-ended or differential input interface over varying
input spans. This converter features digital error correction tech-
niques ensuring 14-bit linearity and a calibration procedure that
corrects for capacitor and gain mismatches. The ADS850 also
includes a high-bandwidth track-and-hold that provides excellent
spurious performance up to and beyond the Nyquist rate.
The ADS850 provides an internal reference that can be pro-
grammed for a 2Vp-p input range for the best spurious perfor-
mance and ease of driving. Alternatively, the 4Vp-p input range
can be used for the lowest input referred noise, offering
superior signal-to-noise performance for imaging applications.
There is also the capability to set the range between 2Vp-p and
4Vp-p, or to use an external reference. The ADS850 also
provides an over-range indicator flag to indicate if the input has
exceeded the full-scale input range of the converter.
The low distortion and high signal-to-noise performance pro-
vide the extra margin needed for communications, imaging,
and test instrumentation applications. The ADS850 is available
in a TQFP-48 package.
14-Bit
Pipelined
ADC Core
Reference and
Mode Select
Reference Ladder
and Driver
Timing Circuitry
Error
Correction
Logic
and
Calibration
Circuitry
3-State
Outputs
T&H
D0
D13
•
•
•
CLK
+V
S
ADS850
VDRV
OE
SELREFBV
REF
REFT
INV
IN
IN
(Opt.)
CM
OVR
14-Bit, 10MSPS Self-Calibrating
ANALOG-TO-DIGITAL CONVERTER
ADS850
SBAS154C – OCTOBER 2000 – REVISED OCTOBER 2002
www.ti.com
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2000, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
ADS850
ADS850
SBAS154C
2
www.ti.com
ELECTRICAL CHARACTERISTICS
At T
A
= full specified temperature range, V
S
= +5V, specified differential input range = 1.5V to 3.5V, internal reference input, sampling rate = 10MSPS after calibration,
and V
REF
= 2V, unless otherwise specified.
ADS850Y
PARAMETERCONDITIONSMINTYPMAXUNITS
RESOLUTION14Bits
SPECIFIED TEMPERATURE RANGE–40 to +85°C
CONVERSION CHARACTERISTICS
Sample Rate10k10MSamples/s
Data Latency7Clk Cycles
ANALOG INPUT
Single-Ended Input RangeV
REF
= 1.01.53.5V
V
REF
= 2.00.54.5V
Differential Input RangeV
REF
= 2.01.53.5V
Common-Mode Voltage2.5V
1V
Input Capacitance20pF
Analog Input Bandwidth–3dBFS Input270MHz
DYNAMIC CHARACTERISTICS
Dierential Linearity Error (Largest Code Error)
f = 4.8MHz±±0.751.0LSB
No Missing CodesTested
Spurious-Free Dynamic Range
(1)
f = 4.8MHz (–1dB input)4Vp-p7585dBFS
(2)
f = 4.8MHz (–1dB input)2Vp-p82dBFS
Signal-to-Noise Ratio (SNR)
f = 4.8MHz (–1dB input)4Vp-p7176dBFS
f = 4.8MHz (–1dB input)2Vp-p73dBFS
Signal-to-(Noise + Distortion) (SINAD)
f = 4.8MHz (–1dB input)4Vp-p7075dBFS
f = 4.8MHz (–1dB input)2Vp-p72dBFS
Effective Number of Bits at 4.8MHz
(3)
12.2Bits
Integral Nonlinearity Error
f = 4.8MHz±±2.55.0LSB
Aperture Delay Time1ns
Aperture Jitter4ps rms
Overvoltage Recovery Time1.5 • FS Input2ns
Full-Scale Step Acquisition Time50ns
+V
S
.......................................................................................................+6V
Analog Input...........................................................(–0.3V) to (+V
S
+0.3V)
Logic Input.............................................................(–0.3V) to (+V
S
+0.3V)
Case Temperature.........................................................................+100°C
Junction Temperature....................................................................+150°C
Storage Temperature.....................................................................+150°C
ABSOLUTE MAXIMUM RATINGS
(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degrada-
tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
PRODUCTDEMO BOARD
ADS850YADS850Y-EVM
DEMO BOARD ORDERING INFORMATION
SPECIFIED
PACKAGETEMPERATUREPACKAGEORDERINGTRANSPORT
PRODUCTPACKAGE-LEADDESIGNATOR
(1)
RANGEMARKINGNUMBERMEDIA, QUANTITY
ADS850YTQFP-48PFB–40°C to +85°CADS850YADS850Y/250Tape and Reel, 250
"""""ADS850Y/2KTape and Reel, 2000
PACKAGE/ORDERING INFORMATION
NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com.
NOTE: (1) Stresses above those listed under “Absolute Maximum Ratings”
may cause permanent damage to the device. Exposure to absolute maximum
conditions for extended periods may affect device reliability.
ADS850
SBAS154C
3
www.ti.com
ELECTRICAL CHARACTERISTICS (Cont.)
At T
A
= full specified temperature range, V
S
= +5V, specified differential input range = 1.5V to 3.5V, internal reference input, sampling rate = 10MSPS after calibration,
and V
REF
= 2V, unless otherwise specified.
ADS850Y
PARAMETERCONDITIONSMINTYPMAXUNITS
DIGITAL INPUTS
Logic Family+3V/+5V Logic Compatible CMOS
Convert CommandStart ConversionRising Edge of Convert Clock
High Level Input Current (V
IN
= 5V)
(4)
100µA
Low Level Input Current (V
IN
= 0V)±µ10A
High Level Input Voltage+2.0V
Low Level Input Voltage+1.0V
Input Capacitance5pF
DIGITAL OUTPUTS
Logic Family+3V/+5V Logic Compatible CMOSV
Logic CodingStraight Offset Binary
Low Output Voltage(I
OL
= 50µA)0.1V
Low Output Voltage(I
OL
= 1.6mA)0.4V
High Output Voltage(I
OH
= 50µA)+4.5V
High Output Voltage(I
OH
= 0.5mA)+2.4V
3-State Enable TimeOE = LOW2040ns
3-State Disable TimeOE = HIGH210ns
Output Capacitance5pF
ACCURACY (4Vp-p Input Range)
Zero Error (Referred to –FS)At 25°±C0.2%FS
Zero Error Drift (Referred to –FS)±°5ppm/C
Gain Error
(5)
At 25°±C0.7%FS
Gain Error Drift
(5)
±°15ppm/C
Gain Error
(6)
At 25°±C0.042
%FS
Gain Error Drift
(6)
±°15ppm/C
Power-Supply Rejection of Gain∆V
S
= ±5%82dB
Reference Input Resistance1.6kΩ
Internal Voltage Reference Tolerance (V
REF
= 2.0V)
(7)
At 25°±C13.5mVmV
Internal Voltage Reference Tolerance (V
REF
= 1.0V)
(7)
At 25°±C6mVmV
POWER-SUPPLY REQUIREMENTS
Supply Voltage: +V
S
Operating+4.7+5.0+5.3V
Supply Voltage: VDRVOperating+2.7+5.3V
Supply Current: +I
S
Operating53mA
Power DissipationVDRV = 3VExternal Reference240mW
VDRV = 5VExternal Reference245mW
VDRV = 3VInternal Reference250275mW
VDRV = 5VInternal Reference255mW
Power-Down20mW
Thermal Resistance,
θ
JA
TQFP-4856.5°C/W
NOTES: (1) Spurious-Free Dynamic Range refers to the difference in magnitude between the fundamental and the next largest harmonic. (2) dBFS means dB
relative to full scale. (3) Effective number of bits (ENOB) is defined by (SINAD – 1.76)/6.02. (4) Internal 50k pull-down resistor. (5) Includes internal reference.Ω
(6) Excludes internal reference. (7) Typical reference tolerance based on 1 sigma of distribution.±
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | ADS850 |
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