SPT7840 View Datasheet(PDF) - Signal Processing Technologies

Part Name

Description

MFG CO.

SPT7840

10-BIT, 10 MSPS, 100 mW A/D CONVERTER

Signal Processing Technologies 

SPT7840

10-BIT, 10 MSPS, 100 mW A/D CONVERTER

FEATURES

• Monolithic 10 MSPS Converter

• 100 mW Power Dissipation

• On-Chip Track-and-Hold

• Single +5 V Power Supply

• TTL/CMOS Outputs

• 5 pF Input Capacitance

• Low Cost

• Tri-State Output Buffers

• High ESD Protection: 3,500 V Minimum

• Selectable +3 V or +5 V Logic I/O

APPLICATIONS

• All High-Speed Applications Where

Low Power Dissipation is Required

• Video Imaging

• Medical Imaging

• IR Imaging

• Scanners

• Digital Communications

GENERAL DESCRIPTION

The SPT7840 is a 10-bit monolithic, low cost, ultralow power

analog-to-digital converter capable of minimum word rates

of 10 MSPS. The on-chip track-and-hold function assures

very good dynamic performance without the need for exter-

nal components. The input drive requirements are mini-

mized due to the SPT7840's low input capacitance of only

5 pF.

Power dissipation is extremely low at only 100 mW typical

(120 mW maximum) at 10 MSPS with a power supply of

+5.0 V. The digital outputs are +3 V or +5 V, and are user

selectable. The SPT7840 is pin-compatible with the entire

family of SPT 10-bit, CMOS converters (SPT7835/40/50/55/

60/61) which simplifies upgrades.

The SPT7840 has incorporated proprietary circuit design

and CMOS processing technologies to achieve its advanced

performance. Inputs and outputs are TTL/CMOS-compat-

ible to interface with TTL/CMOS-logic systems. Output data

format is straight binary.

The SPT7840 is available in 28-lead 300 mil cerdip and

PDIP, 28-lead SOIC and 32-lead small (7 mm square) TQFP

packages over the commercial temperature range. For avail-

ability of extended temperature ranges and /883 processing

requirements, consult the factory.

BLOCK DIAGRAM

1:8

AIN

Mux

CLK In

Enable

Data

Valid

P1

P2

Timing ...

and P7

Control

P8

Ref

In

ADC Section 1

T/H

Auto-

Zero

CMP

ADC Se...ction 2

ADC Section 7

ADC Section 8

T/H

Auto-

Zero

CMP

11-Bit

SAR

11

DAC

...

11-Bit

SAR

11

DAC

Reference Ladder

VRef

11

11

...

11

11

11-Bit

8:1

Mux/

Error

Correction

D10 Overrange

D9 (MSB)

D8

D7

D6

D5

D4

D3

D2

D1

DØ (LSB)

Signal Processing Technologies, Inc.

4755 Forge Road, Colorado Springs, Colorado 80907, USA

Phone: (719) 528-2300 FAX: (719) 528-2370

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