12-Bit, 10MHz Sampling

ANALOG-TO-DIGITAL CONVERTER

FEATURES

● HIGH SFDR: 80dB at NYQUIST

● HIGH SNR: 69dB

● LOW POWER: 180mW

● LOW DLE: ±0.3LSB

● FLEXIBLE INPUT RANGE

● OVERRANGE INDICATOR

APPLICATIONS

● IF AND BASEBAND DIGITIZATION

● CCD IMAGING

● SCANNERS

● TEST INSTRUMENTATION

DESCRIPTION

The ADS804 is a high-speed, high dynamic range, 12-bit,

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

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

lent 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 SNR

performance. The ADS804 is also pin-compatible with the

5MHz ADS803 and the 20MHz ADS805.

The ADS804 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 0.09LSBs 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

ADS804 also provides an over-range indicator flag to indi-

cate 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 ADS804 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 ADS804 is avail-

able in a SSOP-28 package.

12-Bit

Pipelined

A/D Converter Core

Reference and

Mode Select

Reference Ladder

and Driver

Timing Circuitry

Error

Correction

Logic

3-State

Outputs

T&H

D11

•

CLK

ADS804

VDRV

SEL REFBV

REF

REFT

INV

(Opt.)

OVR

ADS804

SBAS068B – JANUARY 1997 – REVISED AUGUST 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.

ADS804E

ADS804

SBAS068B

www.ti.com

, VDRV ........................................................................................... +6V

Analog Input .......................................................... (–0.3V) to (+V

+ 0.3V)

Logic Input ............................................................ (–0.3V) to (+V

+ 0.3V)

Case Temperature ......................................................................... +100°C

Junction Temperature .................................................................... +150°C

Storage Temperature ..................................................................... +150°C

NOTE: (1) Stresses above these ratings may cause permanent damage.

Exposure to absolute maximum conditions for extended periods may degrade

device reliability.

ABSOLUTE MAXIMUM RATINGS

(1)

ADS804E

PARAMETER CONDITIONS MIN TYP MAX UNITS

RESOLUTION 12 Bits

SPECIFIED TEMPERATURE RANGE –40 to +85 °C

CONVERSION CHARACTERISTICS

Sample Rate 10k 10M Samples/s

Data Latency 6 Clk Cycles

ANALOG INPUT

Single-Ended Input Range 1.5 3.5 V

Single-Ended Input Range (Optional) 0 5 V

Common-Mode Voltage +2.5 V

Input Impedance 1.25 || 16 MΩ || pF

Track-Mode Input Bandwidth –3dBFS Input 270 MHz

DYNAMIC CHARACTERISTICS

Differential Linearity Error (Largest Code Error)

f = 500kHz ±0.3 ±0.75 LSB

No Missing Codes Tested

Spurious-Free Dynamic Range

(1)

f = 4.8MHz 73 80 dBFS

2-Tone Intermodulation Distortion

(3)

f = 3.5MHz and 4.0MHz (–7dBFS each tone) 76 dBc

Signal-to-Noise Ratio (SNR)

f = 4.8MHz 66.5 69 dBFS

Signal-to-(Noise + Distortion) (SINAD)

f = 4.8MHz 65 68 dBFS

Effective Number of Bits at 4.8MHz

(4)

11 Bits

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

1.5V to 3.5V Input 0.23 LSBs rms

Integral Nonlinearity Error

f = 500kHz ±1 ±2 LSB

Aperture Delay Time 1ns

Aperture Jitter 4 ps rms

Over-Voltage Recovery Time 1.5 • FS Input 2 ns

Full-Scale Step Acquisition Time 30 ns

ELECTRICAL CHARACTERISTICS

At T

= full specified temperature range, V

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

SPECIFIED

PACKAGE TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT PACKAGE-LEAD DESIGNATOR

(1)

RANGE MARKING NUMBER MEDIA, QUANTITY

ADS804 SSOP-28 DB –40°C to +85°C ADS804E ADS804E Rails, 48

"" " ""ADS804E/1K Tape and Reel, 1000

NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com.

PACKAGE/ORDERING INFORMATION

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 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.

ADS804

SBAS068B

www.ti.com

ELECTRICAL CHARACTERISTICS (Cont.)

At T

= full specified temperature range, V

= +5V, specified single-ended input range = 1.5V to 3.5V, and sampling rate = 10MHz, unless otherwise specified.

DIGITAL INPUTS

Logic Family

Convert Command Start Conversion

High Level Input Current (V

= 5V)

(5)

100 µA

Low Level Input Current (V

= 0V) 10 µA

High Level Input Voltage +3.5 V

Low Level Input Voltage +1.0 V

Input Capacitance 5pF

DIGITAL OUTPUTS

Logic Family

Convert Command

Output Voltages, V

DRV

= +5V

Low Level I

= 50µA +0.1 V

High Level I

= 50µA ±4.6 V

Low Level I

= 1.6mA +0.4 V

High Level I

= 0.5mA ±2.4 V

Output Voltages, V

DRV

= +3V

Low Level I

= 50µA +0.1 V

High Level I

= 50µA +2.5 V

3-State Enable Time OE = L 20 40 ns

3-State Disable Time OE = H 2 10 ns

Output Capacitance 5pF

ACCURACY (5Vp-p Input Range) f

= 2.5MHz

Zero Error (Referred to –FS) At 25°C 0.2 ±1.5 %FS

Zero Error Drift ±5 ppm/°C

Gain Error

(6)

At 25°C ±2.0 %FS

Gain Error Drift

(6)

±15 ppm/°C

Gain Error

(7)

At 25°C ±1.5

%FS

Gain Error Drift

(7)

±15 ppm/°C

Power-Supply Rejection of Gain ∆V

= ±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

POWER-SUPPLY REQUIREMENTS

Supply Voltage: +V

+4.7 +5.0 +5.3 V

Supply Current: +I

36 40 mA

Power Dissipation 180 200 mW

Thermal Resistance,

SSOP-28 50 °C/W

NOTES: (1) Spurious-Free Dynamic Range refers to the magnitude of the largest harmonic. (2) dBFS means dB relative to full-scale. (3) 2-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 2-tone fundamental envelope.

(4) Effective number of bits (ENOB) is defined by (SINAD – 1.76)/6.02. (5) Internal 50kΩ pull-down resistor. (6) Includes internal reference. (7) Excludes internal

reference.

ADS804E

PARAMETER CONDITIONS MIN TYP MAX UNITS

CMOS/TTL Compatible

Straight Offset Binary

CMOS Compatible

Rising Edge of Convert Clock

Part #	ADS804U
Description	Single ADC Pipelined 10Msps 12-bit Parallel 28-Pin SOIC -
Category	IC
Availability	In Stock
Qty	41

Qty	Price
1 - 8	$11.27041
9 - 17	$8.96510
18 - 25	$8.45281
26 - 34	$7.85513
35 +	$7.00132

ADS804U

Related Items

Technical Document