ADS-30639 [MURATA]

ADC, Proprietary Method, 14-Bit, 1 Func, 2 Channel, Parallel, Word Access, CDIP28, METAL SEALED, CERAMIC, DDIP-28;


型号：	ADS-30639
厂家：	muRata
描述：	ADC, Proprietary Method, 14-Bit, 1 Func, 2 Channel, Parallel, Word Access, CDIP28, METAL SEALED, CERAMIC, DDIP-28 CD 转换器
文件：	总6页 (文件大小：98K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ADS -3 0 6 3 9

Dual, 14-Bit, 6.4MHz

Sampling A/D Converter

FEATURES

• 14-bit resolution

• 6.4MHz sampling rate

• Functionally complete

• No missing codes over full military temperature range

• Edge-triggered, 1.7 Watts

• Small, 28-pin, ceramic DDIP

• Ideal for both time and frequency-domain applications

INPUT/OUTPUT CONNECTIONS

FUNCTION

GENERAL DESCRIPTION

INPUT "A"

RANGE

INPUT "B"

–5V

The low-cost ADS-30639 is a dual 14-bit, 6.4MHz sampling

A/D converter. This device accurately samples full-scale input

signals up to Nyquist frequencies with no missing codes. The

dynamic performance of the ADS-30639 has been optimized to

achieve a signal-to-noise ratio (SNR) of 78dB and a total

harmonic distortion (THD) of –80dB. Each channel is

completely independant allowing operation with independant

analog inputs and start convert signals.

+2.5V REFERENCE

ANALOG GROUND

+5VA

+15V

+5VD

DIGITAL GROUND

START CONVERT "B"

ENABLE

BIT 1 (MSB)

BIT 2

START CONVERT "A"

SELECT

BIT 14 (LSB)

BIT 13

Packaged in a miniature 28-pin DDIP, the functionally complete

ADS-30639 contains two individual fast-settling sample-hold

amplifiers and subranging A/D converters, along with an

internal reference, timing/control logic, and error-correction

circuitry. Digital input and output levels are TTL. The ADS-

30639 only requires the rising edge of the start convert pulse

to operate.

BIT 12

BIT 11

BIT 3

BIT 4

BIT 10

BIT 5

BIT 9

BIT 8

BIT 6

BIT 7

Requiring only ±5V and +15V supplies, the ADS-30639

dissipates 1.7 Watts. The device is offered with a bipolar

(±2.0V) analog input range. Model is available for use in –55

to +125°C operating temperature range. A proprietary, auto-

calibrating, error-correcting circuit enables the device to

achieve specified performance over the full military

temperature range. Typical applications include medical

imaging, radar, sonar, communications and instrumentation.

SUBRANGING

A/D

ANALOG INPUT "A"

T/H

BIT 14 (LSB)

BIT 13

"A"

10 BIT 12

11 BIT 11

12 BIT 10

13 BIT 9

14 BIT 8

15 BIT 7

16 BIT 6

17 BIT 5

18 BIT 4

19 BIT 3

20 BIT 2

21 BIT 1 (MSB)

POWER AND GROUNDING

+5V ANALOG SUPPLY

+5V DIGITAL SUPPLY

+15V SUPPLY

–5V SUPPLY

ANALOG GROUND

DIGITAL GROUND

SUBRANGING

ANALOG INPUT "B" 28

T/H

A/D

"B"

START CONVERT "A"

TIMING AND

CONTROL

LOGIC

SELECT

START CONVERT "B" 23

22 ENABLE

Figure 1. ADS-30639 Functional Block Diagram

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • E-mail: sales@datel.com • Internet: www.datel.com

ADS -3 0 6 3 9

ABSOLUTE MAXIMUM RATINGS

PHYSICAL/ENVIRONMENTAL

PARAMETERS

LIMITS

UNITS

PARAMETERS

MIN.

TYP.

MAX.

UNITS

+5V Supply (Pins 5, 25)

+15V Supply (Pin 26)

–5V Supply (Pin 27)

Digital Inputs (Pins 6, 7, 22, 23 )

Analog Input (Pins 1, 28)

Lead Temperature (10 seconds)

0 to +6

12 to 17

0 to –6

Volts

°C

Operating Temp. Range, Case

ADS-30639

Thermal Impedance

–55

—

+125

°C

—

–65

—

+150

°C/Watt

°C

–0.3 to +VDD +0.3

±5

Storage Temperature Range

+300

Package Type

Weight

28-pin, metal-sealed, ceramic DDIP

FUNCTIONAL SPECIFICATIONS

(TA = +25°C, +VDD = +5V, –VDD = –5V, +Vcc = +15V, 6.4MHz sampling rate, ±2V input range, and a minimum 3 minute warmup

unless otherwise specified.)

+25°C

TYP.

0 to +70°C

TYP.

–55 to +125°C

ANALOG INPUT

MIN.

MAX.

MIN.

MAX.

MIN.

TYP.

MAX.

UNITS

Bipolar Input Voltage Range

Input Resistance (Vin A), (Vin B)

Input Capacitance

—

380

—

±2

400

—

420

—

380

—

±2

400

—

420

—

380

—

±2

400

—

420

Volts

Ω

DIGITAL INPUT

Logic Levels

Logic "1"

Logic "0"

+2.0

—

+0.8

+20

–20

—

+2.0

—

+0.8

+20

–20

—

+2.0

—

+0.8

+20

–20

—

Volts

µA

Logic Loading "1"

Logic Loading "0"

Start Convert Positive Pulse Width

Input Capacitance CIN

—

STATIC PERFORMANCE

Resolution

—

–0.90

—

±1

—

±0.3

±0.5

—

–0.90

—

±2

—

±0.5

—

–0.99

—

±3

—

Bits

LSB

%FSR

Bits

Integral Nonlinearity (DC Input)

Differential Nonlinearity (fin = 10kHz)

Full Scale Absolute Accuracy

Bipolar Zero Error (Tech Note 2)

Gain Error (Tech Note 2)

±0.5

±0.1

±0.3

—

±0.5

±0.15

±0.3

—

±0.5

—

+1.25

±0.8

±0.9

—

No Missing Codes (fin = 10kHz)

DYNAMIC PERFORMANCE

Peak Harmonics (–0.5dB)

dc to 975kHz

975kHz to 2.4MHz

—

–80

–76

–78

–70

—

–80

–76

–78

–70

—

–80

–76

–68

Total Harmonic Distortion (–0.5dB)

dc to 975kHz

975kHz to 2.4MHz

—

–80

–75

–77

–69

—

–80

–75

–77

–69

—

–80

–75

–74

–67

Signal-to-Noise Ratio

(w/o distortion, –0.5dB)

dc to 975kHz

—

975kHz to 2.4MHz

Signal-to-Noise Ratio

(& distortion, –0.5dB)

dc to 975kHz

975kHz to 2.4MHz

Noise

—

150

—

150

—

150

—

µVrms

Two-tone Intermodulation

Distortion (fin = 240kHz, 200kHz

fs = 6.4MHz, –0.5dB)

Input Bandwidth (–3dB)

Small Signal (–20dB input)

Large Signal (–0.5dB input)

Feedthrough Rejection (fin = 500kHz)

Slew Rate

—

–76

–70

—

–76

–70

—

–76

–70

—

±450

—

±450

—

±450

—

MHz

V/µs

Aperture Delay Time

Aperture Uncertainty

ps rms

ADS -3 0 6 3 9

+25°C

TYP.

0 to +70°C

TYP.

–55 to +125°C

DYNAMIC PERFORMANCE (Cont.)

MIN.

MAX.

MIN.

MAX.

MIN.

TYP.

MAX.

UNITS

S/H Acquisition Time

( to ±0.003%FSR, 5V step)

Overvoltage Recovery Time

A/D Conversion Rate

—

6.4

175

—

6.4

175

—

6.4

175

—

MHz

DIGITAL OUTPUTS

Logic Levels

Logic "1"

Logic "0"

Logic Loading "1"

Logic Loading "0"

+2.4

GND

—

Vcc

+0.4

–4

+2.4

GND

—

Vcc

+0.4

–4

+2.4

GND

—

Vcc

+0.4

–4

Volts

—

Output Coding

Two’s Complement

—

Output Capacitance COUT

—

±20

µA

Tri-State Output Leakage Current IOZ

±20

POWER REQUIREMENTS

Power Supply Ranges

+5V Supply

–5V Supply

+4.9

–4.5

+13.5

+5.0

–5.0

+15

+5.25

–5.5

+16.5

+4.9

–4.5

+13.5

+5.0

–5.0

+15

+5.25

–5.5

+16.5

+4.9

–4.5

+13.5

+5.0

–5.0

+15

+5.25

–5.5

+16.5

Volts

+15V Supply

Power Supply Currents

+5V Supply

–5V Supply

+15V Supply

Power Dissipation

Power Supply Rejection

—

220

1.7

—

270

1.9

±0.05

—

220

1.7

—

270

1.9

±0.05

—

220

1.7

—

270

1.9

±0.05

Watts

%FSR/%V

Footnotes:

Effective bits is equal to:

All power supplies should be on before applying a start convert pulse. All

supplies and the clock (start convert pulses) must be present during warmup

periods. The device must be continuously converting during this time.

Full Scale Amplitude

Actual Input Amplitude

(SNR + Distortion) – 1.76 + 20 log

6.02

During the 3-minute warm up period there is a slight offset and gain drift but

the dynamic specifications of the ADS-30639 are not affected.

+5 VA and 5 VD supplies are connected internally.

Contact DATEL for other input voltage ranges.

A 50% duty cycle start convert pulse is used for all production testing. For

applications requiring less than an 6.4MHz sampling rate, wider start convert pulses

can be used. A 50% duty cycle is recommended for all sampling fequencies.

TECHNICAL NOTES

1. Obtaining fully specified performance from the ADS-30639

requires careful attention to pc card layout and power

supply decoupling. The device’s analog and digital ground

systems are connected to each other internally. For optimal

performance, tie all ground pins (4 and 24) directly to a

large analog ground plane beneath the package.

2. The ADS-30639 achieves its specified accuracies without

the need for external calibration. It is recommended that

the +5VA and +5VD supplies should be powered up from

the same source.

3. A passive bandpass filter is used at the input of the A/D for

all production testing.

Bypass all power supplies to ground with 4.7 F tantalum

capacitors in parallel with 0.1 F ceramic capacitors. Locate

the bypass capacitors as close to the unit as possible.

ADS -3 0 6 3 9

THERMAL REQUIREMENTS

See Ordering Information for the assigned part number. See

All DATEL sampling A/D converters are fully characterized and

specified over operating temperature (case) range of

–55 to +125°C. All room temperature (T^A= +25°C) production

testing is performed without the use of heat sinks or forced air

cooling. Thermal impedance figures for each device are listed

in their respective specification tables.

page 1-183 of the DATEL Data Acquisition Components Catalog

for more information on the HS Series. Request DATEL

Application Note AN8, "Heat Sinks for DIP Data Converters", or

contact DATEL directly, for additional information.

These devices do not normally require heat sinks, however,

standard precautionary design and layout procedures should

be used to ensure devices do not overheat. The ground and

power planes beneath the package, as well as all pcb signal

runs to and from the device, should be as heavy as possible to

help conduct heat away from the package.

Table 1. Output Coding

INPUT VOLT.

±2V

BIPOLAR

SCALE

MSB

LSB

01 1111 1111 1111 +1.99976

01 1000 0000 0000 +1.50000

01 0000 0000 0000 +1.00000

+FS – 1LSB

+3/4FS

+1/2FS

–1/2FS

–3/4FS

–FS+1LSB

–FS

Electrically-insulating, thermally-conductive "pads" may be

installed underneath the package. Devices should be soldered

to boards rather than socketed, and of course, minimal air flow

over the surface can greatly help reduce the package

temperature.

00 0000 0000 0000

0.00000

11 0000 0000 0000 –1.00000

10 1000 0000 0000 –1.50000

10 0000 0000 0001 –1.99976

10 0000 0000 0000 –2.00000

In more severe ambient conditions, the package/junction

temperature of a given device can be reduced dramatically

(typically 35%) by using one of DATEL's HS Series heat sinks.

TWO’S COMP

Original Specification

Min(ns)

Max(ns) Typ(ns)

VDD = +5V, CL=60pF

Tpwh

Tpwl

Minimum convert pulse width high

Minimum convert pulse width low

New conversion to internal data valid (Internal)

Output enable to data valid

—

Tnctdv

Toetdv

Tseltdv

Tdctdv

Todtdz

Tctdv

Select change to data valid

Internal data to data valid (Internal)

Output disable to high-impedence

Conversion to data valid

sample (n)

taken on

rising edge

Tpwh

Tpwl

START

CONVERT

A & B

ENABLE

SELECT

Tctdv

Tseltdv

Tctdv Todtdz

An-2

Toetdv

DATA ON

BUS

An-3

Bn-3

An-3

An-2

Channel

A Selected

Channel

A Selected

Channel

B Selected

Figure 2. Timing Diagram

Male BNC

DC25S

100

Male BNC

74AS573

Input A

Input B

MSB

19 MSB

Range

100

10uF

B10

+2.5V REF

10uF

ADS-30639

ADS-30465

EN VCC OE

+15V

11 20 1.10

10uF

+15V

–5V

+5V

10uF

B11

B12

–5V

Start Con A

Start Con B

B13

LSB

74AS573

Select

A, B

Gnd Enable

+5VA +5VD

13 LSB

+5V

VCC

10uF

74S86

1.10

74S86

+5V

74S86

+5V

10uF

+5V

74ACT74

+5V

Select A

Select B

74ACT74

XTAL

12.8M

MHz

200

+5V

200

+5V

Figure 3. ADS-30639 Connection Diagram

ADS -3 0 6 3 9

MECHANICAL DIMENSIONS

INCHES (mm)

1.570 MAX.

(39.88)

Dimension Tolerances (unless otherwise indicated):

2 place decimal (.XX) ±0.010 (±0.254)

3 place decimal (.XXX) ±0.005 (±0.127)

Lead Material: Kovar alloy

Lead Finish: 50 microinches (minimum) gold plating

over 100 microinches (nominal) nickel plating

0.80 MAX.

(20.32)

0.100 TYP.

(2.540)

1.300 TYP.

(33.00)

0.210 MAX.

(5.334)

PIN 1 INDEX

(

ON TOP)

0.200 MAX.

(5.080)

0.012 ±0.003

(0.305)

0.185 MAX.

(4.70)

0.100

(2.540)

0.100

(2.540)

0.018 ±0.002

(0.457)

(2.540)

0.600 ±0.010

(15.240)

SEATING

0.040

(10.160)

PLANE

0.025

(0.635)

ORDERING INFORMATION

OPERATING

28-PIN

MODEL

TEMP. RANGE

PACKAGE

ADS-30639

–55 to +125°C

DDIP

ISO 9001

INNOVATION and EXCELLENCE

R E G I S T E R E D

DS-0438D 03/00

DATEL (UK) LTD. Tadley, England Tel: (01256)-880444

DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01

DATEL GmbH München, Germany Tel: 89-544334-0

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151

Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356

Internet: www.datel.com E-mail:sales@datel.com

Data Sheet Fax Back: (508) 261-2857

DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025

DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein

do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.

ADS-30639 [MURATA]

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