Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsData collecting ICsData acquisition IC - AD converter (ADC) External , Internal SSOP 28

12-Bit, 53MHz Sampling

ANALOG-TO-DIGITAL CONVERTER

FEATURES

● SPURIOUS-FREE DYNAMIC RANGE:

82dB at 10MHz f

● HIGH SNR: 67.5dB (2Vp-p), 69dB (3Vp-p)

● LOW POWER: 335mW

●

INTERNAL OR EXTERNAL REFERENCE

● LOW DNL: 0.5LSB

● FLEXIBLE INPUT RANGE: 2Vp-p to 3Vp-p

● SSOP-28 PACKAGE

DESCRIPTION

The ADS807 is a high-speed, high dynamic range,

12-bit pipelined Analog-to-Digital (A/D) converter. This con-

verter includes a high-bandwidth track-and-hold that gives

excellent spurious performance up to and beyond the Nyquist

rate. The differential nature of this track-and-hold and A/D

converter circuitry minimizes even-order harmonics and gives

excellent common-mode noise immunity. The track-and-hold

can also be operated single-ended.

The ADS807 provides for setting the full-scale range of the

converter without any external reference circuitry. The inter-

nal reference can be disabled allowing low drive, internal

references to be used for improved tracking in multichannel

systems.

The ADS807 provides an over-range indicator flag to indicate

an input signal that exceeds the full-scale input range of the

converter. This flag can be used to reduce the gain of front

end gain control circuitry. There is also an output enable pin

to allow for multiplexing and testability on a PC board.

The ADS807 employs digital error correction techniques to

provide excellent differential linearity for demanding imaging

applications.

APPLICATIONS

● COMMUNICATIONS IF PROCESSING

● COMMUNICATIONS BASESTATIONS

● TEST EQUIPMENT

● MEDICAL IMAGING

● VIDEO DIGITIZING

● CCD DIGITIZING

Pipelined

A/D

Converter

Internal

Reference

Optional External

Reference

Timing

Circuitry

Error

Correction

Logic

3-State

Outputs

T/H

•

D11

CLK

ADS807

INT/EXT

+2.5V

+3V

+2V

+3V

SEL

(Opt.)

ADS807

SBAS072A – JANUARY 1999 – REVISED JULY 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.

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.

Summary of content (21 pages)

PAGE 1
ADS807 ADS 807 E SBAS072A – JANUARY 1999 – REVISED JULY 2002 12-Bit, 53MHz Sampling ANALOG-TO-DIGITAL CONVERTER FEATURES DESCRIPTION ● SPURIOUS-FREE DYNAMIC RANGE: 82dB at 10MHz fIN ● HIGH SNR: 67.5dB (2Vp-p), 69dB (3Vp-p) ● LOW POWER: 335mW ● INTERNAL OR EXTERNAL REFERENCE ● LOW DNL: 0.5LSB ● FLEXIBLE INPUT RANGE: 2Vp-p to 3Vp-p ● SSOP-28 PACKAGE The ADS807 is a high-speed, high dynamic range, 12-bit pipelined Analog-to-Digital (A/D) converter.
PAGE 2
ELECTROSTATIC DISCHARGE SENSITIVITY ABSOLUTE MAXIMUM RATINGS(1) +VS ....................................................................................................... +6V Analog Input ........................................................... (–0.3V) to (+VS + 0.3V) Logic Input ............................................................. (–0.3V) to (+VS + 0.3V) Case Temperature ......................................................................... +100°C Junction Temperature .....................
PAGE 3
ELECTRICAL CHARACTERISTICS At TA = full specified temperature range, VS = +5V, differential input range = 2V to 3V for each input, sampling rate = 50MHz, unless otherwise noted. ADS807E PARAMETER CONDITIONS MIN Ambient Air –40 +85 °C 2 1.5 1.75 1 3 3.5 3.25 4 V V V V µA MHz MΩ || pF 53M Samples/s Clock Cycles ±1.0 ±1.0 LSB LSB ±4.
PAGE 4
ELECTRICAL CHARACTERISTICS (Cont.) At TA = full specified temperature range, VS = +5V, differential input range = 2V to 3V for each input, sampling rate = 50MHz, unless otherwise noted. ADS807E PARAMETER DIGITAL OUTPUTS Logic Family Logic Coding Low Output Voltage (IOL = 50µA) Low Output Voltage, (IOL = 1.6mA) High Output Voltage, (IOH = 50µA) High Output Voltage, (IOH = 0.
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TIMING DIAGRAM N+2 N+1 Analog In N+4 N+3 N tD N+5 tL tCONV N+7 N+6 tH Clock 6 Clock Cycles t2 Data Out N–6 N–5 N–4 N–3 N–2 N–1 N Data Invalid SYMBOL tCONV tL tH tD t1 (1) t2 (1) N+1 t1 DESCRIPTION MIN Convert Clock Period Clock Pulse LOW Clock Pulse HIGH Aperture Delay Data Hold Time, CL = 0pF New Data Delay Time, CL = 15pF max 18.87 9.4 9.4 TYP MAX UNITS 100µs ns ns ns ns ns ns tCONV/2 tCONV/2 2 2.7 12 NOTE: (1) t1 and t2 times are valid for VDRV voltages of +2.7V to +5V.
PAGE 6
TYPICAL CHARACTERISTICS At TA = full specified temperature range, differential input range = 2V to 3V, sampling rate = 50MHz, and internal reference, unless otherwise noted.
PAGE 7
TYPICAL CHARACTERISTICS (Cont.) At TA = full specified temperature range, differential input range = 2V to 3V, sampling rate = 50MHz, and internal reference, unless otherwise noted. SPECTRAL PERFORMANCE (Sampling Frequency = 53MHz) UNDERSAMPLING (Sampling Frequency = 27MHz) 0 0 fIN = 21MHz SNR = 68dBFS SFDR = 72dBFS –20 Magnitude (dBFS) Magnitude (dBFS) –20 fIN = 50MHz SNR = 65dBFS SFDR = 73dBFS –40 –60 –40 –60 –80 –80 –100 –100 0 5.3 10.6 15.9 21.2 26.5 0 4.5 Frequency (MHz) 9.
PAGE 8
TYPICAL CHARACTERISTICS (Cont.) At TA = full specified temperature range, differential input range = 2V to 3V, sampling rate = 50MHz, and internal reference, unless otherwise noted. DIFFERENTIAL LINEARITY ERROR INTEGRAL LINEARITY ERROR 2.0 2.0 fIN = 1MHz fIN = 1MHz 1.5 1.0 1.0 0.5 0.5 ILE (LSB) DLE (LSB) 1.5 0 –0.5 0 –0.5 –1.0 –1.0 –1.5 –1.5 –2.0 –2.0 0 1024 2048 3072 4096 0 1024 Output Codes 4096 2.0 fIN = 10MHz fIN = 10MHz 1.5 1.5 1.0 1.0 0.5 0.
PAGE 9
• improves the noise immunity based on the converter’s common-mode input rejection APPLICATION INFORMATION THEORY OF OPERATION The ADS807 is a high-speed, CMOS A/D converter which employs a pipelined converter architecture consisting of 12 internal stages. Each stage feeds its data into the digital error correction logic ensuring excellent differential linearity and no missing codes at the 12-bit level. The output data becomes valid after the rising clock edge (see Timing Diagram).
PAGE 10
will improve the SNR performance, but depending on the signal source, large resistor values may be detrimental to achieving good harmonic distortion. In any case, optimizing the R-C values for the specific application is encouraged. Transformer Coupled, Single-Ended to Differential Configuration If the application requires a signal conversion from a singleended source to drive the ADS807 differentially, an RF transformer might be a good solution.
PAGE 11
402Ω 200Ω VIN A1 OPA642 1.82kΩ 0.1µF 16.5Ω 1.82kΩ REFT IN 100pF 402Ω ADS807E 402Ω A2 OPA642 0.1µF 16.5Ω IN 100pF 1.82kΩ REFB 1.82kΩ FIGURE 2. AC-Coupled Differential Driver Interface with OPA642. RF 499Ω 0.1µF RIN 249Ω RS 24.9Ω VIN A1 IN RP 499Ω 499Ω 68pF VCM = +2.5V ADS807E CM 0.1µF +5V RS 24.9Ω A2 OPA2681 IN 68pF RF 499Ω RG 499Ω RP 499Ω 0.1µF FIGURE 3. AC-Coupled, Differential Interface for Single-Supply Operation.
PAGE 12
Single-Ended, AC-Coupled, Dual-Supply Interface DC-Coupled, Differential Driver with Level Shift The circuit provided in Figure 4 shows typical connections for using the ADS807 in a single-ended input configuration. The bias requirements for AC-coupling are provided by a single resistor to the CM output lead. The single-ended mode of operation should be considered for ease of interface complexity and applications where the dynamic performance can be compromised.
PAGE 13
REFERENCE OPERATION USING EXTERNAL REFERENCES The internal reference consists of a bandgap voltage reference, the drivers for the top and bottom reference, and the resistive reference ladder. The bandgap reference circuit includes logic functions that allow setting the analog input swing of the ADS807 to a differential full-scale range of either 2Vp-p or 3Vp-p by simply tying the FSSEL pin to a LOW or HIGH potential, respectively.
PAGE 14
INPUT REFERENCE IN (Pin-25) IN (Pin-24) 2Vp-p Differential 1Vp-p Times 2 Inputs Internal or External 2V to 3V 3V to 2V REFT REFB +3V +2V 2Vp-p Single-Ended 2Vp-p Times 1 Input Internal or External 1.5V to 3.5V 2.5VDC +3V +2V 3Vp-p Differential 1.5Vp-p Times 2 Inputs Internal or External 3Vp-p Single-Ended 3Vp-p Times 1 Input Internal or External 1.75V to 3.35V 3.25V to 1.75V +3.25V +1.75V 1V to 4V 2.
PAGE 15
performance. All ground connections on the ADS807 are internally joined together eliminating the need for split ground planes. The ground pins (1, 20, 26) should directly connect to an analog ground plane which covers the PC board area under the converter. While designing the layout, it is important to keep the analog signal traces separated from any digital lines to prevent noise coupling onto the analog signal path.
PAGE 16
PACKAGE OPTION ADDENDUM www.ti.
PAGE 17
PACKAGE OPTION ADDENDUM www.ti.com 31-May-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
PAGE 18
PACKAGE MATERIALS INFORMATION www.ti.com 30-May-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device ADS807E/1K Package Package Pins Type Drawing SSOP DB 28 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 1000 330.0 16.4 Pack Materials-Page 1 8.1 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 10.4 2.5 12.0 16.
PAGE 19
PACKAGE MATERIALS INFORMATION www.ti.com 30-May-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) ADS807E/1K SSOP DB 28 1000 367.0 367.0 38.
PAGE 20
MECHANICAL DATA MSSO002E – JANUARY 1995 – REVISED DECEMBER 2001 DB (R-PDSO-G**) PLASTIC SMALL-OUTLINE 28 PINS SHOWN 0,38 0,22 0,65 28 0,15 M 15 0,25 0,09 8,20 7,40 5,60 5,00 Gage Plane 1 14 0,25 A 0°–ā8° 0,95 0,55 Seating Plane 2,00 MAX 0,10 0,05 MIN PINS ** 14 16 20 24 28 30 38 A MAX 6,50 6,50 7,50 8,50 10,50 10,50 12,90 A MIN 5,90 5,90 6,90 7,90 9,90 9,90 12,30 DIM 4040065 /E 12/01 NOTES: A. B. C. D. All linear dimensions are in millimeters.
PAGE 21
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