SPT SPT7814ACN, SPT7814AIJ, SPT7814BCN, SPT7814BCU, SPT7814BIJ Datasheet

SPT7814

10-BIT, 40 MSPS, ECL OUTPUT A/D CONVERTER

FEATURES

• Monolithic 40 MSPS Converter

• On-Chip Track/Hold

• Bipolar ±2.0 V Analog Input

• 57 dB SNR @ 3.58 MHz Input

• 50 dB SNR @ 10.3 MHz Input

• Low Power (1.3 W Typical)

• 5 pF Input Capacitance

• ECL Outputs

GENERAL DESCRIPTION

The SPT7814 A/D converter is a 10-bit monolithic converter
capable of word rates of a minimum of 40 MSPS. On board
track/hold function assures excellent dynamic performance
without the need for external components. Drive require­ment problems are minimized with an input capacitance of
only 5 pF.

Inputs and outputs are ECL to provide a higher level of noise
immunity in high speed system applications. An overrange
output signal is provided to indicate overflow conditions.

APPLICATIONS

• Medical Imaging

• Professional Video

• Radar Receivers

• Instrumentation

• Electronic Warfare

• Digital Communications

Output data format is straight binary. Power dissipation is
very low at only 1.3 watts with power supply voltages of +5.0
and -5.2 volts. The SPT7814 also provides a wide input
voltage swing of ±2.0 volts.

The SPT7814 is available in a 28-lead ceramic sidebrazed
DIP, PDIP, and die form. Commercial and industrial tempera­ture ranges are currently offered. Contact the factory for
availability of military temperature ranges and /833 pro­cessed units.

BLOCK DIAGRAM

Analog

Input

Coarse

A/D

Analog

Prescaler

T/H Amplifier

Bank

Successive Interpolation

Stage i

Successive Interpolation

Stage i+1

Successive Interpolation

Stage N

4

Digital

Output

10

Decoding Network

Signal Processing Technologies, Inc.

4755 Forge Road, Colorado Springs, Colorado 80907, USA

Phone: [phone] FAX: [phone]

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

Supply Voltages

VCC............................................................... -0.3 to +6 V

Output

Digital Outputs .......................................... +30 to -30 mA

VEE............................................................... +0.3 to -6 V

Temperature

Input Voltages

Analog Input............................................... VFB≤VIN≤V

VFT, V

..............................................................

FB

+3.0 V, -3.0 V

Reference Ladder Current .....................................12 mA

FT

Operating Temperature ..............................-25 to +85 °C

(1)

Junction Temperature

...........................................

+175 °C

Lead Temperature, (soldering 10 seconds)........ +300 °C

Storage Temperature................................ -65 to +150 °C

Note: 1. Operation at any Absolute Maximum Rating is not implied. See Electrical Specifications for proper nominal

applied conditions in typical applications.

ELECTRICAL SPECIFICATIONS

TA=T

PARAMETERS CONDITIONS LEVEL MIN TYP MAX MIN TYP MAX UNITS

Resolution 10 10 Bits
DC Accuracy (+25 °C) ± Full Scale

- T

min

Integral Nonlinearity 250 kHz Sample Rate V ±1.0 ±1.5 LSB
Differential Nonlinearity V ±0.5 ±0.75 LSB
No Missing Codes VI Guaranteed Guaranteed

, VCC=+5.0 V, VEE=-5.2 V, VIN=±2.0 V, VSB=-2.0 V, VST=+2.0 V, f

max

TEST TEST SPT7814A SPT7814B

=40 MHz, 50% clock duty cycle, unless otherwise specified.

clock

Analog Input

Input Voltage Range VI ±2.0 ±2.0
Input Bias Current V
Input Resistance VI 100 300 100 300 kΩ
Input Capacitance V 5 5 pF
Input Bandwidth 3 dB Small Signal V 120 120 MHz
+FS Error V ±2.0 ±2.0 LSB

-FS Error V ±2.0 ±2.0 LSB

Reference Input

Reference Ladder Resistance VI 500 800 500 800 Ω
Reference Ladder Tempco V 0.8 0.8 Ω/°C

Timing Characteristics

Maximum Conversion Rate VI 40 40 MHz
Overvoltage Recovery Time V 20 20 ns
Pipeline Delay (Latency) IV 1 1
Output Delay TA=+25 °CV5 5ns
Aperture Delay Time T
Aperture Jitter Time TA=+25 °C V 5 5 ps-RMS

Dynamic Performance

Effective Number of Bits
f

=1 MHz 8.7 8.2 Bits

IN

=3.58 MHz 8.7 8.2 Bits

f

IN

fIN=10.3 MHz 7.3 6.9 Bits

=0 V VI 3060 3060µA

IN

Clock Cycle

=+25 °CV1 1ns

A

Typical thermal impedances: 28L sidebrazed DIP: θja = 50 °C/W,

28L plastic DIP: θ

= 50 °C/W.

ja

SPT

SPT7814

2 3/11/97

ELECTRICAL SPECIFICATIONS

TA=T

PARAMETERS CONDITIONS LEVEL MIN TYP MAX MIN TYP MAX UNITS

Dynamic Performance

- T

min

, VCC=+5.0 V, VEE=-5.2 V, VIN=±2.0 V, VSB=-2.0 V, VST=+2.0 V, f

max

=40 MHz, 50% clock duty cycle, unless otherwise specified.

clock

TEST TEST SPT7814A SPT7814B

Signal-To-Noise Ratio
(without Harmonics)

f

=1 MHz +25 °C I 55 57 52 54 dB

IN

=3.58 MHz +25 °C I 55 57 52 54 dB

f

IN

=10.3 MHz +25 °C I 48 50 46 48 dB

f

IN

TA=T

TA=T

TA=T

min

min

min

- T

- T

- T

max

max

max

IV 53 55 50 52 dB
IV 53 55 50 52 dB
IV 45 47 43 45 dB

Harmonic Distortion

=1 MHz +25 °C I 54 56 52 54 dB

f

IN

=3.58 MHz +25 °C I 54 56 52 54 dB

f

IN

f

=10.3 MHz +25 °C I 46 48 43 45 dB

IN

TA=T

TA=T

TA=T

min

min

min

- T

- T

- T

max

max

max

IV 51 53 49 51 dB
IV 51 53 49 51 dB
IV 45 47 41 43 dB

Signal-to-Noise and Distortion

=1 MHz +25 °C I 52 54 49 51 dB

f

IN

f

=3.58 MHz +25 °C I 52 54 49 51 dB

IN

f

=10.3 MHz +25 °C I 44 46 41 43 dB

IN

Spurious Free Dynamic Range +25 °C,
Differential Phase +25 °C, f

TA=T

TA=T

TA=T

- T

min

max

- T

min

max

- T

min

max

fIN=1 MHz V 67 67 dB

=3.58 & 4.35 MHz V 0.2 0.2 Degree

IN

IV 49 46 dB
IV 49 46 dB
IV 43 40 dB

Differential Gain +25 °C, fIN=3.58 & 4.35 MHz V 0.5 0.7 %

Digital Inputs

Logic 1 Voltage VI -1.1 -1.1 V
Logic 0 Voltage VI -1.5 -1.5 V
Maximum Input Current Low VI -500 ±200 +750 -500 ±200 +750 µA
Maximum Input Current High VI -500 ±300 +750 -500 +300 +750 µA
Pulse Width Low (CLK) IV 10 10 ns
Pulse Width High (CLK) IV 10 300 10 300 ns

Digital Outputs

Logic 1 Voltage 50 Ω to -2 V VI -1.1 -0.8 -1.1 -0.8 V
Logic 0 Voltage 50 Ω to -2 V VI -1.8 -1.5 -1.8 -1.5 V

Power Supply Requirements

VoltagesV
CurrentsI

-V

-I

CC

EE

CC

EE

IV +4.75 -5.0 +5.25 +4.75 +5.0 +5.25 V
IV -4.95 -5.2 -5.45 -4.95 -5.2 -5.45 V
VI 140 170 140 190 mA

VI 115 140 115 160 mA
Power Dissipation Outputs Open VI 1.3 1.6 1.3 1.8 W
Power Supply Rejection Ratio (5 V ±0.25 V, -5.2 V ±2.0 V) V 1.0 1.0 LSB

SPT

SPT7814

3 3/11/97

TEST LEVEL CODES

TEST LEVEL

TEST PROCEDURE

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.

Figure 1A: Timing Diagram

N

t

pwH

CLK

t

pwL

II

III
IV

V

VI

I

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.

N+1

N+2

CLK

Output

Data

t

d

Data Valid

N

Data Valid

N+1

Figure 1B: Single Event Clock

CLK

CLK

t

d

Output

Data

Data Valid

Table I - Timing Parameters

PARAMETERS DESCRIPTION MIN TYP MAX UNITS

t

d

t

pwH

CLK to Data Valid Prop Delay - 5 ns
CLK High Pulse Width 10 - 300 ns

t

pwL

SPT

CLK Low Pulse Width 10 - - ns

SPT7814

4 3/11/97