Burr Brown Corporation ADS803U-1K, ADS803U, ADS803E-1K, ADS803 Datasheet

ADS803E

ADS803U

ADS803

®

12-Bit, 5MHz Sampling

ANALOG-TO-DIGITAL CONVERTER

TM

FEA TURES

● HIGH SFDR: 82dB at NYQUIST

● HIGH SNR: 69dB

● LOW POWER: 115mW

● LOW DLE: 0.25LSB

●

SMALL 28-LEAD SSOP AND SOIC PACKAGES

● FLEXIBLE INPUT RANGE

● OVER-RANGE INDICATOR

APPLICATIONS

● IF AND BASEBAND DIGITIZATION

● CCD IMAGING SCANNERS

● TEST INSTRUMENTATION

DESCRIPTION

The ADS803 is a high-speed, high dynamic range, 12-bit pipelined
analog-to-digital converter. This converter includes a high-band­width track/hold that gives excellent spurious performance up to
and beyond the Nyquist rate. This high-bandwidth, linear track/hold
minimizes harmonics and has low jitter, leading to excellent SNR
performance. The ADS803 is also pin-compatible with the 10MHz
ADS804 and the 20MHz ADS805.

The ADS803 provides an internal reference and can be programmed
for a 2Vp-p input range for the best spurious performance and ease
of driving. Alternatively, the 5Vp-p input range can be used for the
lowest input referred noise of 0.09 LSBs rms giving superior
imaging performance. There is also a capability to set the input

range in between the 2Vp-p and 5Vp-p input ranges or to use
external reference. The ADS803 also provides an overrange indica­tor flag to indicate an input range that exceeds the full-scale input
range of the converter. This flag can be used to reduce the gain of
the front end gain-ranging circuitry.

The ADS803 employs digital error correction techniques to provide
excellent differential linearity for demanding imaging applications.
Its low distortion and high SNR give the extra margin needed for
communications, medical imaging, video and test instrumentation
applications. The ADS803 is available in 28-lead SSOP and SOIC
packages.

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

©

1997 Burr-Brown Corporation PDS-1398C Printed in U.S.A. October, 1998

12-Bit
Pipelined
A/D Core

Reference and

Mode Select

Reference Ladder

and Driver

Timing Circuitry

Error

Correction

Logic

3-State

Outputs

T/H

D0

D11

•

•

•

CLK

+V

S

ADS803

VDRV

OE

SEL REFBV

REF

REFT

INV

IN

IN

CM

OVR

2

®

ADS803

SPECIFICATIONS

At TA = full specified temperature range, VS = +5V, specified input range = 1.5V to 3.5V, single-ended input and sampling rate = 5MHz, unless otherwise specified.

CMOS/TTL Compatible

Straight Offset Binary

CMOS/TTL Compatible

Straight Offset Binary

CMOS Compatible

Rising Edge of Convert Clock

CMOS Compatible

Rising Edge of Convert Clock

ADS803U ADS803E

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 12 Guaranteed ✻

(1)

Bits

SPECIFIED TEMPERATURE RANGE –40 to +85 –40 to +85 °C
CONVERSION CHARACTERISTICS

Sample Rate 10k 5M ✻✻Samples/s
Data Latency 6 ✻ Clk Cycles

ANALOG INPUT

Single-Ended Input Range 1.5 3.5 ✻✻V
Standard Optional Single-Ended Input Range 0 5 ✻✻V
Common-Mode Voltage 2.5 ✻ V
Standard Optional Common-Mode Voltage 1 ✻ V
Input Capacitance 20 ✻ pF
Track-Mode Input Bandwidth –3dBFS Input 270 ✻ MHz

DYNAMIC CHARACTERISTICS

Differential Linearity Error (Largest Code Error)

f = 500kHz ±0.25 ±0.75 ✻✻ LSB
No Missing Codes Guaranteed Guaranteed
Spurious Free Dynamic Range

(2)

f = 2.48MHz (–1dB input) 74 82 ✻✻ dBFS
Two-Tone Intermodulation Distortion

(4)

74 ✻ dBc

f = 1.8M and 1.9M (–7dBFS each tone)
Signal-to-Noise Ratio (SNR)

f = 2.48MHz (–1dB input) 66.5 69 ✻✻ dB
Signal-to-(Noise + Distortion) (SINAD)

f = 2.48MHz (–1dB input) 65 68 ✻✻ dB
Effective Number of Bits at 2.48MHz

(5)

11 ✻ Bits

Input Referred Noise 0V to 5V Input 0.09 ✻ LSBs rms

1.5V to 3.5V Input 0.23 ✻ LSBs r ms

Integral Nonlinearity Error

f = 500kHz ±1 ±2 ✻✻ LSB
Aperture Delay Time 1 ✻ ns
Aperture Jitter 4 ✻ ps rms
Overvoltage Recovery Time 1.5 x FS Input 2 ✻ ns
Full-Scale Step Acquisition Time 50 ✻ ns

DIGITAL INPUTS

Logic Family
Convert Command Start Conversion
High Level Input Current (V

IN

= 5V)

(6)

100 ✻ µA

Low Level Input Current (V

IN

= 0V) ±10 ✻ µA
High Level Input Voltage +3.5 ✻ V
Low Level Input Voltage +1.0 ✻ V
Input Capacitance 5 ✻ pF

DIGITAL OUTPUTS

Logic Family V
Logic Coding
Low Output Voltage (I

OL

= 50µA) 0.1 ✻ V

Low Output Voltage (I

OL

= 1.6mA) 0.4 ✻ V

High Output Voltage (I

OH

= 50µA) +4.5 ✻ V

High Output Voltage (I

OH

= 0.5mA) +2.4 ✻ V
3-State Enable Time OE = L 20 40 ✻✻ ns
3-State Disable Time OE = H 2 10 ✻✻ ns
Output Capacitance 5 ✻ pF

ACCURACY (5Vp-p Input Range)

Zero Error (Referred to –FS) At 25°C 0.2 ±1.5 ✻✻ %FS
Zero Error Drift (Referred to –FS) ±5 ✻ ppm/°C
Gain Error

(7)

At 25°C ±2.0 ✻ %FS

Gain Error Drift

(7)

±15 ✻ ppm/°C

Gain Error

(8)

At 25°C ±1.5 ✻

%FS

Gain Error Drift

(8)

±15 ✻ ppm/°C

Power Supply Rejection of Gain ∆ V

S

= ±5% 60 82 ✻✻ dB
Reference Input Resistance 1.6 ✻ kΩ
Internal Voltage Reference Tolerance (V

REF

= 2.5V)

At 25°C ±35 ✻ mV

Internal Voltage Reference Tolerance (V

REF

= 1.0V)

At 25°C ±14 ✻ mV

3

®

ADS803

POWER SUPPLY REQUIREMENTS

Supply Voltage: +V

S

Operating +4.7 +5.0 5.3 ✻✻✻ V

Supply Current: +I

S

Operating 23 27 ✻✻ mA
Power Dissipation Operating 115 135 ✻✻ mW
Thermal Resistance,

θ

JA

28-Lead SOIC 75 °C/W
28-Lead SSOP 50 °C/W

NOTES: (1) An asterisk (✻) indicates same specifications as the ADS803U. (2) Spurious Free Dynamic Range refers to the magnitude of the largest harmonic.
(3) dBFS means dB relative to full scale. (4) Two-tone intermodulation distortion is referred to the largest fundamental tone. This number will be 6dB higher if it
is referred to the magnitude of the two-tone fundamental envelope. (5) Effective number of bits (ENOB) is defined by (SINAD – 1.76)/6.02. (6) Internal 50kΩ pull­down resistor. (7) Includes internal reference. (8) Excludes internal reference.

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.

SPECIFICATIONS (CONT)

At TA = full specified temperature range, VS = +5V, specified input range = 1.5V to 3.5V, single-ended input and sampling rate = 5MHz, unless otherwise specified.

ADS803U ADS803E

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

+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

ELECTROSTATIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Burr-Brown
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 degradation
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.

PRODUCT DEMO BOARD

ADS803U DEM-ADS80xU

DEMO BOARD ORDERING INFORMATION

PACKAGE SPECIFIED
DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT PACKAGE NUMBER

(1)

RANGE MARKING NUMBER MEDIA

ADS803U SO-28 Surface Mount 217 –40°C to +85°C ADS803U ADS803U Rails
ADS803E SSOP-28 Surface Mount 324 –40°C to +85°C ADS803E ADS803E Rails

" " " " " ADS803E/1K Tape and Reel

NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. For detailed Tape and Reel
mechanical information refer to Appendix B of Burr-Brown IC Data Book.

PACKAGE/ORDERING INFORMATION

4

®

ADS803

PIN CONFIGURATION

PIN DESIGNATOR DESCRIPTION

1 OVR Over Range Indicator
2 B1 Data Bit 1 (MSB)
3 B2 Data Bit 2
4 B3 Data Bit 3
5 B4 Data Bit 4
6 B5 Data Bit 5
7 B6 Data Bit 6
8 B7 Data Bit 7

9 B8 Data Bit 8
10 B9 Data Bit 9
11 B10 Data Bit 10
12 B11 Data Bit 11
13 B12 Data Bit 12 (LSB)
14 CLK Convert Clock Input
15 OE Output Enable
16 +V

S

+5V Supply
17 GND Ground
18 SEL Input Range Select
19 V

REF

Reference Voltage Select
20 REFB Bottom Reference
21 CM Common-Mode Voltage
22 REFT Top Reference
23 IN Complementary Analog Input
24 GND Analog Ground
25 IN Analog Input (+)
26 GND Analog Ground
27 +V

S

+5V Supply
28 VDRV Output Driver Voltage

PIN DESCRIPTIONS

Top View SOIC/SSOP

6 Clock Cycles

Data Invalid

t

D

tLt

H

t

CONV

N–6 N–5 N–4 N–3 N–2 N-1 N N+1Data Out

Clock

Analog In

N

t

2

N+1

N+2

N+3

N+4

N+5

N+6

N+7

t

1

TIMING DIAGRAM

SYMBOL DESCRIPTION MIN TYP MAX UNITS

t

CONV

Convert Clock Period 200 100µsns

t

L

Clock Pulse Low 96 99 ns

t

H

Clock Pulse High 96 99 ns

t

D

Aperture Delay 3 ns

t

1

Data Hold Time, CL = 0pF 3.9 ns

t

2

New Data Delay Time, CL = 15pF max 12 ns

OVR

B1
B2
B3
B4
B5
B6
B7
B8

B9
B10
B11
B12
CLK

VDRV
+V

S

GND
IN
GND
IN
REFT
CM
REFB
VREF
SEL
GND
+V

S

OE

1
2
3
4
5
6
7
8

9
10
11
12
13
14

28
27
26
25
24
23
22
21
20
19
18
17
16
15

ADS803