IC 12-BIT 20MHZ A/D 28-SSOP

ADS805E

Manufacturer Part NumberADS805E
DescriptionIC 12-BIT 20MHZ A/D 28-SSOP
ManufacturerTexas Instruments
ADS805E datasheet
 


Specifications of ADS805E

Number Of Bits12Sampling Rate (per Second)20M
Data InterfaceParallelNumber Of Converters1
Power Dissipation (max)345mWVoltage Supply SourceSingle Supply
Operating Temperature-40°C ~ 85°CMounting TypeSurface Mount
Package / Case28-SSOP (0.200", 5.30mm Width)Input Signal TypeSingle Ended, Differential
Number Of Adc Inputs1Conversion Rate20000 KSPs
Resolution12 bitArchitecturePipelined
Input Voltage3.5 V, 5 VInterface TypeParallel
Snr68 dBVoltage ReferenceInternal, External
Supply Voltage (max)5.25 VSupply Voltage (min)4.75 V
Maximum Power Dissipation345 mWMaximum Operating Temperature+ 85 C
Minimum Operating Temperature- 40 CMounting StyleSMD/SMT
Power Consumption300 mWSample And HoldYes
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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12-Bit, 20MHz Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
HIGH SFDR: 74dB at 9.8MHz f
HIGH SNR: 68dB
LOW POWER: 300mW
LOW DLE: 0.25LSB
FLEXIBLE INPUT RANGE
OVER-RANGE INDICATOR
DESCRIPTION
The ADS805 is a 20MHz, high dynamic range, 12-bit, pipelined
Analog-to-Digital Converter ADC. This converter includes a
high-bandwidth track-and-hold that gives excellent spurious
performance up to and beyond the Nyquist rate. This high-
bandwidth, linear track-and-hold minimizes harmonics and
has low jitter, leading to excellent Signal-to-Noise Ratio
(SNR) performance. The ADS805 is also pin-compatible with
the 10MHz ADS804 and the 5MHz ADS803.
The ADS805 provides an internal reference or an external
reference can be used. The ADS805 can be programmed for
a 2Vp-p input range which is the easiest to drive with a single
op amp and provides the best spurious performance. Alter-
V
IN
IN
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.
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.
APPLICATIONS
STUDIO CAMERAS
IN
IF AND BASEBAND DIGITIZATION
COPIERS
TEST INSTRUMENTATION
natively, the 5Vp-p input range can be used for the lowest
input-referred noise of 0.09LSBs rms giving superior imaging
performance. There is also the capability to set the input
range between 2Vp-p and 5Vp-p, either single-ended or
differential. The ADS805 also provides an over-range flag
that indicates when the input signal has exceeded the
converter’s full-scale range. This flag can also be used to
reduce the gain of the front end signal conditioning circuitry.
The ADS805 employs digital error techniques to provide
excellent differential linearity for demanding imaging applica-
tions. Its low distortion and high SNR give the extra margin
needed for communications, medical imaging, video, and
test instrumentation applications. The ADS805 is available in
an SSOP-28 package.
+V
CLK
S
ADS805
Timing Circuitry
12-Bit
Error
Pipelined
T&H
Correction
ADC Core
Logic
IN
CM
Reference Ladder
and Driver
Reference and
Mode Select
REFT
V
SEL
REFB
REF
www.ti.com
ADS805
SBAS073B – JANUARY 1997 – REVISED NOVEMBER 2002
VDRV
D0
3-State
Outputs
D11
OVR
OE
Copyright © 1997, Texas Instruments Incorporated

ADS805E Summary of contents

  • Page 1

    ... IN 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. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty ...

  • Page 2

    ... Includes internal reference. (7) Excludes internal reference. www.ti.com ELECTROSTATIC DISCHARGE SENSITIVITY ORDERING TRANSPORT (2) NUMBER MEDIA, QUANTITY ADS805E ADS805E Rails, 48 " ADS805E/1K Tape and Reel, 1000 ADS805E TYP MAX 12 Bits Tested –40 to +85 20M Samples/s 6 Clk Cycles 3 270 0.25 ...

  • Page 3

    ... Rising Edge of Convert Clock +3.5 CMOS/TTL Compatible Straight Offset Binary ( 1.6mA +4 0.5mA) +2 2.5MHz Operating +4.75 Operating Operating 50 pull-down resistor. (6) Includes internal reference. (7) Excludes internal reference. www.ti.com ADS805E TYP MAX UNITS 100 +1 0 0.3 1.5 %FS 5 ppm/ C 0.7 2.0 %FS 18 ppm/ C 0.2 1.5 %FS 10 ...

  • Page 4

    PIN CONFIGURATION Top View 1 28 OVR ADS805 B10 11 18 B11 12 ...

  • Page 5

    TYPICAL CHARACTERISITCS full specified temperature range +5V, specified single-ended input range = 1.5V to 3.5V, and sampling rate = 20MHz, unless otherwise specified SPECTRAL PERFORMANCE 0 –20 –40 –60 –80 –100 –120 0 ...

  • Page 6

    TYPICAL CHARACTERISITCS full specified temperature range +5V, specified single-ended input range = 1.5V to 3.5V, and sampling rate = 20MHz, unless otherwise specified DYNAMIC PERFORMANCE vs INPUT FREQUENCY 85 SFDR ...

  • Page 7

    TYPICAL CHARACTERISITCS full specified temperature range +5V, specified single-ended input range = 1.5V to 3.5V, and sampling rate = 20MHz, unless otherwise specified OUTPUT NOISE HISTOGRAM (DC Input) 800k 600k 400k 200k 0 ...

  • Page 8

    APPLICATION INFORMATION DRIVING THE ANALOG INPUT The ADS805 allows its analog inputs to be driven either single-ended or differentially. The focus of the following discussion is on the single-ended configuration. Typically, its implementation is easier to achieve and the rated ...

  • Page 9

    –1V 2Vp NOTE – FIGURE 2. DC-Coupled, Single-Ended Input Configuration with DC-level Shift. offset. The selection criteria for an appropriate op amp ...

  • Page 10

    A simple model of the internal reference circuit is shown in Figure 4. The internal blocks are a 1V-bandgap voltage reference, buffer, the resistive reference ladder and the drivers for the top and bottom reference which supply the necessary current ...

  • Page 11

    SELECTING THE INPUT RANGE AND REFERENCE Figures 7 through 9 show a selection of circuits for the most common input ranges when using the internal reference of the ADS805. All examples are for single-ended input and operate with a nominal ...

  • Page 12

    MSB OVR FIGURE 11. External Logic for Decoding Under-Range and Over-Range Conditions. CLOCK INPUT REQUIREMENTS Clock jitter is critical to the SNR performance of high-speed, high-resolution ADCs. It leads to aperture jitter (t noise to the signal being converted. The ...

  • Page 13

    ... Package Type Package Status ADS805E ACTIVE SSOP ADS805E/1K ACTIVE SSOP ADS805E/1KG4 ACTIVE SSOP ADS805EG4 ACTIVE SSOP ADS805U OBSOLETE SOIC ADS805U/1K OBSOLETE SOIC (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. ...

  • Page 14

    PACKAGE OPTION ADDENDUM Addendum-Page 2 21-May-2010 ...

  • Page 15

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing ADS805E/1K SSOP DB PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 (mm) Diameter Width (mm) W1 (mm) 28 1000 330.0 16.4 8.2 Pack Materials-Page 1 30-Jan-2009 B0 (mm) K0 (mm Pin1 (mm) (mm) Quadrant 10.5 2 ...

  • Page 16

    ... Device Package Type ADS805E/1K SSOP PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 1000 Pack Materials-Page 2 30-Jan-2009 Width (mm) Height (mm) 346.0 346.0 33.0 ...

  • Page 17

    ...

  • Page 18

    DB (R-PDSO-G**) 28 PINS SHOWN 0, 2,00 MAX PINS ** DIM A MAX A MIN NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C. Body dimensions do not ...

  • Page 19

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...