12-Bit, 10µS H ybrid AD C

H S AD C85D ata Converter Line

FEATURES

• –55ºC to +125ºC Operation• M IL-STD-883 Processing• 10 µS Conversion Time• Low Power, 1.32W (max)• Replacement for A DC85/84 and A DC-HX12B/HZ12B

DESCRIPTION

The HS A DC85 is specif ically designed to replacethe A DC581,. A DC85/84 and A DC-HX12B/HZ12B.Complete with internal clock, reference and inputbuffer amplif ier, the HS A DC85 can also be usedwith an external clock for synchronization (seeEXTERNA L CLOCK section under A PPLICA TIONSINFORM A TION). Conversion speeds of 10 µs for 12-Bit operation and 8 µs for 10-Bit operation allowsthe HS A DC85 to be used in a wide range ofapplications. Short cycle and internal clock ratemay also be externally adjusted to provide fasterconversion speeds at lower resolutions. Gain andoffset can be externally trimmed to zero,providing full-scale accuracy of ±0.012% ±1/2 LSB.Data is obtainable in both parallel and serial formwith corresponding clock and status signals.Digital input and output signals are DTL/TTLcompatible. Other features include:

Low Power — A 33% reduction in powerdissipation allows the HS A DC85 to operatereliably at high temperatures without failure dueto excessive package heating. Total powerconsumed is only 1.32 W maximum.

Selectable Input Ranges — Input scaling resistorsallow the selection of input ranges of ±2.5V , ±5V ,±10V , 0 to +5V or 0 to +10V .

Reliability — Packaged in a 32-pin hermetically sealedcase and utilizing advanced devices and laser-trimmed thin f ilm resistors, the HS A DC85 is one ofthe most reliable analog-to-digital converters to date.Specif ied over the –55ºC to +125ºC temperaturerange, it has a low linearity drif t specif ication of only±2 ppm/ºC maximum. A ll “ B” versions of the HSA DC85 series are fully screened and tested to M IL-STD-883 Rev. C, Level B requirements.

20

32

14

21

17

19

18

29

30

STA TUS

SERIA L OUT

SHORT CY CLE

STA RT

CLOCKRA TE CONTROLCLOCK OUT

REF OUT

BUFFER OUT

BUFFER IN

FUNCTIONAL DIAGRAM

131 2 3 4 5 6 7 8 9 10 11 12LSB M SB M SB

SA R

DA C

COM P

CLOCK

REF–

+

–

+

26

31

15

16

28

A NA GND

DIG GND

+5V

– 5V

– 15V

27 24 25 23 22

GA IN 10V 20V BIPOLA R

165Cedar Hill Street,Marlborough,MA01752 Tel:508.485.6350 Fax: 508.485.5168www.SpectrumMicrowave.com

SPECIFICATIO N S(Typical @ +25ºC and rated power supply unless otherwise noted)

SERIES HSA DC85

TY PE Successive A pproximation

RESOLUTION 12-Bits

A NA LOG INPUTSBipolar Ranges ±2.5V . ±5V . ±10VUnipolar Ranges 0 to +5V , 0 to +10VImpedance (Direct Input) 300 / V oltBuffer A mplif ier

Impedance 100M (min)Bias Current 50 nASettling Time1 2 µS

DIGITA L INPUTS2

Start Positive Pulse 50nS W ide (min). Trailing Edge(“ 1” to “ 0” ) Initiates Conversion3

Logic Loading 1 TTL LoadExternal Clock Optional4

DIGITA L OUTPUTS2

Parallel DataOutput Codes

Unipolar Comp. Straight Bin.Bipolar Comp. Offset Bin., Comp, Two's Comp.

Output Drive 2 TTL Loads (min)Serial (Non Return to Zero) Data

Output Codes Comp. Straight Bin., Comp. Offset Bin.Output Drive 2 TTL Loads (min)

Status Logic “ 1” During ConversionStatus Output Drive 2 TTL Loads (min)

Clock Out4

Output Drive 2 TTL Loads (min)Frequency 1.4 M Hz

REFERENCE Internal +6.2V ±5%Ref Out 200 µA M aximum with no Degradation of SpecsDrif t ±10ppm/ºC (max)

CONV ERSION TIM E/THROUGHPUT RA TE 8.8 µS, Typ; 10 µS, max/100 kHz

A CCURA CY @ 25ºCQuantization ±1/2LSBLinearity ±0.012% of F.S.R. (max)Offset5

Unipolar ±0.05% of F.S.R.Bipolar ±0.1% of F.S.R.(max)

Gain5 ±0.1% of F.S.R.M onotonicity No M issing Codes

STA BILITYLinearity

–25ºC to +85ºC ±1 ppm/ºC; ±2 ppm/ºC, (max)–55ºC to +125ºC ±2 ppm/ºC. (max)

Scale Factor (Gain)–25ºC to +85ºC ±8 ppm/ºC; ±15 ppm/ºC, (max)–55ºC to +125ºC ±20 ppm/ºC, (max)

Offset (Unipolar)–25ºC to +85ºC ±2 ppm/ºC; ±3 ppm/ºC, (max)–55ºC to +125ºC ±3 ppm/ºC. (max)

Offset (Bipolar)–25ºC to +85ºC ±4 ppm/ºC; ±7 ppm/ºC. (max)–55ºC to +125ºC ±12 ppm/ºC, (max)

Total Transfer A ccuracy–25ºC to +85ºC ±10 ppm/ºC; ±20 ppm/ºC. (max)–55ºC to +125ºC ±30 ppm/ºC, (max)

HS ADC85 SERIES

Continued on next page.

SPECIFICA TIONS(Typical @ +25ºC and rated power supply unless otherwise noted)

SERIES HS A DC85

POW ER SUPPLY

Requirements+15V , Rated +14.25 to +15.75V @ 28 mA (max)–15V , Rated –14.25V to+15.75V @ 30 mA (max)+5V , Rated +4.75V to +5.25V @ 91 mA (max)

Rejection Ratio+15V Supply ±0.005% F.S.R,/% V s–15V Supply ±0.005% F.S.R,/% V s+5V Supply ±0.002% F.S.R,/% V s

Power Consumption 1.32W (max)

TEM PERA TUREOperating –55ºC to +125ºC B V ersion

ºC to 70ºC C V ersion

M ECHA NICA LCase Style 32-Pin Hermetic M etal

NOTES1. For 20V step to 0.01% . Settling Time adds to Conversion Time when buffer is connected to input.2. DTL/TTL compatible, i.e. logic “ 0” = 0.8V max. logic “ 1” = 2.0V min., for inputs and. for digital outputs, logic “ 0” = +0.4V max. and logic “ 1” = 2.4V min.3. See TIM ING DIA GRA M under A PPLICA TIONS INFORM A TION.4. HS A DC85 can accept external clock. See TIM ING DIA GRA M under A PPLICA TIONS INFORM A TION.5. Externally adjustable, see OPTIONA L OFFSET A ND GA IN A DJUSTM ENTS under A PPLICA TIONS INFORM A TION.

CA SE ENV ELOPE DIM ENSIONS

1.150

(29.21)M A X

0.900

(22.86)

0.220

(5.588)M IN

0.018 ±0.002

(0.457 ±0.050)

0.220

(5.588)M A X

1.750

(44.45)M A X

0.100

(2.540)TY P

0.10

(2.54)

TOP V IEW

RED DOTINDICA TES PIN 1

DIM ENSIONSINCHES

(M M )

0.10

(2.54)

1 32

16 17

PIN FUNCTION PIN FUNCTION

1 BIT12(LSB) 32 SERIA L OUT

2 BIT 11 31 –15V

3 BIT 10 30 BUFFER IN

4 BIT 9 29 BUFFER OUT

5 BITS 28 +15V

6 BIT 7 27 GA IN A DJ.

7 BIT 6 26 A NA LOG GND.*

8 BIT 5 25 20V RA NGE

9 BIT 4 24 10V RA NGE

10 BIT 3 23 BIPOLA R OFFSET

11 BIT 2 22 COM PA RA TOR IN

12 BIT 1(M SB) 21 STA RT

13 BIT 1 (M SB) 20 STA TUS

14 SHORT CY CLE 19 CLOCK OUT

15 DIGITA L GND. 18 REF OUT

16 +5V 17CLOCK RA TE CONTROL* *

• DIGITA L GND (Pin 15), and A NA LOG GND (Pin 26) should be tiedtogether as close to the unit as possible. If these grounds must be runseparately, use a wide conductor pattern and a nonpolarized 0.01 jiF to0.1 p,F bypass capacitor between the two.

* * See A PPLICA TIONS INFORM A TION for connections.

PIN A SSIGNM ENTS

HS ADC85 SERIES