SPT SPT7720SIT Datasheet

FEATURES

SPT7720

8-BIT, 200 MSPS A/D CONVERTER

TECHNICAL DATA

MAY 9, 2001

APPLICATIONS

• Pin-compatible with AD9054

• High conversion rate: 200 MSPS

• Less than ±1/2 LSB DLE

• 7.16 effective number of bits (ENOB) at 70 MHz

• Single +5 V power supply

• Internal THA and voltage reference

• Low power: 430 mW

• 500 MHz full-power bandwidth

•1 VPP input range

• Single or demuxed TTL output ports

• 44-lead TQFP

GENERAL DESCRIPTION

The SPT7720 is an 8-bit, high-speed, analog-to-digital
converter implemented in a 0.5 µm BiCMOS process. It
utilizes a folding and interpolating architecture that pro­vides both high sample rates and low power. The device
comes complete with a high bandwidth track-and-hold
amplifier and internal voltage reference.

BLOCK DIAGRAM

V

REF

• Digital sampling oscilloscopes (DSO)

• RGB video processing

• Digital communications

• High-speed instrumentation

• Projection display systems

The SPT7720 digital inputs interface directly to TTL,
CMOS or positive ECL (PECL) logic. The digital outputs
are user selectable in either single-channel or dual-chan­nel modes. It is a pin-compatible, direct replacement for
the AD9054. The SPT7720 is availab le in a 44-lead TQFP
surface mount package over the industrial temperature
range of –40 to +85 °C.

V

IN

REF

OUT

AIN

AIN

+

THA

Quantizer



Reference

8

Channel A

Binary

ENCODE

ENCODE

Timing & Control

DEMUX

DSDS

Encoder

Channel B

8

Signal Processing Technologies, Inc.

4755 Forge Road, Colorado Springs, Colorado 80907, USA

Phone: [phone] Fax: [phone] Web Site: http://www .spt.com e-mail: [e-mail]

 DA

DA

7

DB7  DB

0

0

ABSOLUTE MAXIMUM RATINGS (Beyond which damage may occur)1 25 °C

Supply Voltages

VDD........................................................................+6 V

Input Voltages

Analog Inputs ............................................... 0.0 to V

Digital Inputs ................................................ 0.0 to V

V

REFL

, V

................................................ 0.0 to V

REFH

Temperatures

Operating T emper ature .......................... –40 to +85 °C

Storage Temperature............................–65 to +125 °C

DD

Note 1. Operation at any Absolute Maximum Rating is not implied. See

DD
DD

Electrical Specifications for proper nominal applied conditions in
typical applications.

ELECTRICAL SPECIFICATIONS

TA=T

to T

MIN

PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS
DC Accuracy

Differential Linearity Error (DLE) +25 °C I ±0.41 ±0.75 LSB
Integral Linearity Error (ILE) +25 °C I ±0.56 ±1.0 LSB
No Missing Codes VI Guaranteed

Gain Error +25 °C I ±1.06 ±1.08 %FS
Gain Tempco V 0 ppm/°C

Switching Performance

Encode Pulsewidth High +25 °C IV 2.125 15 ns
Encode Pulsewidth Low +25 °C IV 2.125 15 ns
Aperture Delay (t
Aperture Uncer tainty (Jitter) & Noise +25 °C V 4.5 ps rms
Data Sync Setup Time (t
Data Sync Hold Time (t
Data Sync Pulsewidth Time (t
Output Valid Time (t
Output Prop. Delay (tPD) IV 6.7 8.0 ns

, VDD=+5.0 V , external reference, ƒS=200 MSPS, input amplitude = –1 dBFS, unless otherwise noted

MAX

TEST TEST SPT7720

–40 °C to +85 °C V ±1.0 ±1.0 LSB
–40 °C to +85 °C V ±0.9 ±1.2 LSB

) +25 °C V 0.57 ns

A

) +25 °CIV0 ns

SDS

) +25 °C IV 0.5 ns

HDS

) IV 4.4 5.7 ns

V

) +25 °C IV 2.0 ns

PWDS

Dynamic Performance

Transient Response +25 °C V 1.5 ns
Overvoltage Recovery Time +25 °C V 1.5 ns
Signal-to-Noise Ratio (SNR)
(without harmonics)

= 19.7 MHz +25 °CV 47dB

ƒ

IN

= 19.7 MHz –40 °C to +85 °CV 47 dB

ƒ

IN

ƒIN = 70.1 MHz +25 °C I 44 46.3 dB

= 70.1 MHz –40 °C to +85 °C V 45.8 dB

ƒ

IN

Signal-to-Noise Ratio and Distortion
(SINAD)

= 19.7 MHz +25 °CV 47dB

ƒ

IN

= 19.7 MHz –40 °C to +85 °CV 43 dB

ƒ

IN

ƒIN = 70.1 MHz +25 °C I 43 44.9 dB

= 70.1 MHz –40 °C to +85 °C V 44.5 dB

ƒ

IN

2nd Harmonic Distortion

= 19.7 MHz +25 °CV –59 dBc

ƒ

IN

= 70.1 MHz +25 °CV –55.4 dBc

ƒ

IN

3rd Harmonic Distor tion

= 19.7 MHz +25 °CV –58 dBc

ƒ

IN

= 70.1 MHz +25 °CV –56.4 dBc

ƒ

IN

Total Harmonic Distortion (THD)

= 70.1 MHz +25 °CI –50.9 –46.0 dBc

ƒ

IN

= 70.1 MHz –40 to +85 °CV –48.3 dBc

ƒ

IN

Effective Number of Bits (ENOB)

= 70.1 MHz +25 °C I 6.9 7.16 Bits

ƒ

IN

ƒIN = 70.1 MHz –40 to +85 °C V 6.5 Bits

SPT

SPT7720

2 5/9/01

ELECTRICAL SPECIFICATIONS

TA=T

to T

MIN

PARAMETERS CONDITIONS LEVEL MIN TYP MAX UNITS
Analog Input

Input Voltage Range (differential) V ±0.5 V
Compliance Range V 1.8 3.2 V
Input Offset Voltage +25 °C I ±4 ±16 mV
Input Offset Voltage –40 °C to +85 °C V ±8 ±19 mV
Input Resistance +25 °C V 36 62 kΩ
Input Capacitance V 4 pF
Input Bias Current +25 °C I 11 50 µA
Input Bias Current –40 °C to +85 °CV 75µA
Full Power Bandwidth V 500 MHz

Reference Output Voltage VI 2.4 2.5 2.6 V

Temperature Coefficient V 110 ppm/°C

Differential Digital Inputs

High Level Current –40 to +85 °C V 500 625 µA
Low Level Current –40 to +85 °C V 500 625 µA
Input Capacitance V 3 pF

Differential Inputs

Differential Signal Amplitude IV 400 mV
High Input Voltage I V 1.5 V
Low Input Voltage IV 0 V
Common-Mode Input Voltage IV 1.5 V

, VDD=+5.0 V , external reference, ƒS=200 MSPS, input amplitude = –1 dBFS, unless otherwise noted

MAX

TEST TEST SPT7720

>1.5 V differential
>1.5 V differential

DD

–0.4 V

DD

V

Demux Input

High Input Voltage V I 2.0 V
Low Input Voltage VI 0 0 .8 V

Digital Outputs

High Output Voltage Source 800 µA VI 2.4 3. 9 V
Low Output Voltage Sink 1.6 mA VI 0.8 0 .4 V
Output Coding Binary

Power Supply

Supply Current –40 to +85 °C VI 86 111 mA

V

DD

Power Dissipation VI 430 555 mW
Power Supply Sensitivity +25 °C IV 0.005 0.015 V/V

TEST LEVEL CODES

All electrical characteristics are subject to the
following conditions:

All parameters having min/max specifications
are guaranteed. The Test Level column indicates
the specific device testing actually performed
during production and Quality Assurance
inspection. Any blank section in the data column
indicates that the specification is not tested at
the specified condition.

TEST LEVEL

I

II

III

IV

V

VI

TEST PROCEDURE

100% production tested at the specified temperature.
100% production tested at TA = +25 °C, and sample tested at

the specified temperatures.
QA sample tested only at the specified temperatures.
Parameter is guaranteed (but not tested) by design and

characterization data.
Parameter is a typical value for information purposes only.
100% production tested at TA = +25 °C. Parameter is

guaranteed over specified temperature range.

DD

V

SPT

SPT7720

3 5/9/01