MAXWELL 7672RPFE05, 7672RPFB10, 7672RPFB05, 7672RPDS10, 7672RPDI10 Datasheet

1

Memory

All data sheets are subject to change without notice

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12-Bit A/D Converter

7672

©2001 Maxwell Technologies

All rights reserved.

12.19.01 Rev 11

1000565

FEATURES:

• 12-bit high speed A/D converter

•R

AD-PAK® radiation-hardened against natural space radia-

tion

• Total dose hardness:

- > 100 krad (Si), depending upon space mission

• Excellent Single Event Effect

- SEL > 120 Mev/mg/cm

2

- SEUTH > 5.8 Mev/mg/cm

2

- SEU

Sat

= -1E-4 cm2/Device

• Package:

- 24 pin R

AD-PAK® flat package

- 24 pin R

AD-PAK® DIP

• Fast conversion times:

- 7672-05: 5 µs

- 7672-10: 10 µs

• Low 110 mW typical power consumption

- Corrects all single-bit errors

- Detects all double and some triple-bit errors

• High-speed BiCMOS technology

- Choice of +5V and +10V input ranges

- Operates with +5V and -12V power supplies

- Fast 125 ns bus-access time

DESCRIPTION:

Maxwell Technologies’ 7672 high-speed 12-bit analog-to-

digital converter microcircuit features a greater than 100 krad
(Si) total dose tolerance, depending upon space mission. The
7672 uses an accurate high-speed DAC and comparator to
achieve conversion time as low as 5 µs while dissipating only
110 mW of power. The 7672 is designed to be used with an
external reference voltage. This allows the user to choose a
reference whose performance suits the application or to drive
multiple 7672s from a single system reference, since the refer­ence input is buffered and draws very little current. For digital
signal processing applications where absolute accuracy and
temperature coefficients may be unimportant, a low cost refer­ence can be used. For optimal precision, a high accuracy ref­erence where an absolute 12-bit accuracy can be obtained
over a wide temperature range may be used. Analog input
range is pin-selectable for 0 to +5V, 0 to +10V, or ±5V, making
the ADC ideal for data acquisition and analog input/output
cards. A high-speed digital interface (125 ns data access time)
with three state data outputs is compatible with most micro­processors.

Maxwell Technologies' patented R

AD-PAK® packaging technol-

ogy incorporates radiation shielding in the microcircuit pack­age. It eliminates the need for box shielding while providing
the required radiation shielding for a lifetime in orbit or space
mission. In a GEO orbit, R

AD-PAK provides greater than 100

krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.

12-BIT DAC

+

-

+

-

SUCCESSIVE APPROXIMATION

REGISTER

CONTROL

LOGIC

CLOCK

OSCILLATOR

12-BIT LATCH

THREE-STATE

OUTPUT DRIVERS

2 1 24

23

22

21

19

20

18

17

4 11 12 13 163

V

REF

AIN1 AIN2

V

DD

V

SS

BUSY

CS

RD

CLK OUT

CLK IN

D0D3DGNDD4D11AGND

Logic Diagram

Memory

2

All data sheets are subject to change without notice

©2001 Maxwell Technologies

All rights reserved.

12-Bit A/D Converter

7672

12.19.01 Rev 11

1000565

TABLE 1. 7672 PINOUT DESCRIPTION

PIN SYMBOL DESCRIPTION

1 AIN1 Analog Input

2V

REF

Voltage-Reference Input

3 AGND Analog Ground

4-11 D11-D4 Three-State Data Outputs

12 DGND Digital Ground

13-16 D3-D0 Three-State Data Outputs

17 CLKIN Clock Input

18 CLKOUT Clock Output

19 RD

READ Input

20 CS

CHIP SELECT

21 BUSY

BUSY

22 V

SS

Negative Supply, -12V

23 V

DD

Positive Supply, +5V

24 AIN2 Analog Input

TABLE 2. 7672 ABSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL MIN MAX UNITS

Positive Supply Voltage to DGND V

DD

-0.3 7.0 V

Negative Supply Voltage to DGND V

SS

-17 +0.3c V

AGND to DGND -- -0.3 V

DD

+0.3 V

AIN1, AIN2 to AGND -- -15 +15 V

Digital Input Voltage to DGND V

IN

-0.3 VDD +0.3 V

Digital Output Voltage to DGND V

OUT

-0.3 VDD +0.3 V

V

REF

to AGND -- VSS -0.3 VDD +0.3 V

Power Dissipation to +75°C P

D

-- 1000 mW

Power Dissipation above 75°C (Derate) -- -- 10 mW/°C

Thermal Impedance

Θ

JC

-- 3.24 °C/W

Storage Temperature Range T

STG

-65 +150 °C

Operating Temperature Range T

A

-55 +125 °C

Memory

3

All data sheets are subject to change without notice

©2001 Maxwell Technologies

All rights reserved.

12-Bit A/D Converter

7672

12.19.01 Rev 11

1000565

TABLE 3. 7672 RECOMMENDED OPERATING CONDITIONS

PARAMETER SYMBOL MIN MAX UNITS

Positive Supply Voltage V

DD

4.75 5.25 V

Negative Supply Voltage V

SS

-13.2 -10.8 V

V

REF

Input Range V

REF

-5.05 -4.95 V

Power Dissipation V

DD

= 5V, VSS = -12V P

D

-- 179 mW

TABLE 4. 7672 DC ELECTRICAL CHARACTERISTICS

(VDD = 5V ±5%, VSS = -12V ±10%, V

REF

= -5V, TA = -55 TO 125 °C UNLESS OTHERWISE SPECIFIED)

P

ARAMETER SYMBOL TEST CONDITION MIN MAX UNITS

Input Low Voltage V

IL

-- 0.8 V

Input High Voltage V

IH

2.4 -- V

Output Low Voltage V

OL

I

SINK

= 1.6 mA -- 0.4 V

Output High Voltage V

OH

I

SOURCE

= -200 µA 4.0 -- V

Input Leakage Current I

IN

(CS,RD) VIN = VDD or GND
(CLKIN) V

IN

= VDD or GND

--

--

±10
±20

µA

Output Leakage Current I

LKG

(D0-D11) V

OUT

= VDD or GND -- ±10 µA

Input Capacitance

1

C

IN

-- 10 pF

Floating State Output Capacitance

2

C

OUT

-- 15 pF

Power Supply Current I

DD

I

SS

--

--

7

-12

mA

Power Supply Rejection, V

DD

PSRR (VDD)VDD = 4.75 to 5.25 volts

V

SS

= -12V

-- ±1 LSB

Power Supply Rejection, V

SS

PSRR (VSS)VSS = -10.8 to -13.2 volts

V

DD

= 5V

-- ±1 LSB

Analog Input Current (AIN1 or AIN2) I

AIN

Unipolar Range: 0 to 5 V, 10V
Bipolar Range: ±5V

--

--

±3.5

±1.75

mA

V

REF

Input Range

1

V

REF

-5.05 -4.95 V

V

REF

Input Current I

REF

-- ±3 µA

Resolution RES T

A

= -55 to +125°C 12 -- bits

Integral Nonlinearity INL T

A

= +25 °C

T

A

= -55 to +125°C

--

--

±1
±1

LSB

Differential Nonlinearity DNL 12 bits, no missing codes

T

A

= -55 to +125°C

-- ±0.9 LSB

Unipolar Offset Error UOE T

A

= +25°C

T

A

= -55 to +125°C

--

--

±5
±6

LSB

Unipolar Gain Error UGE T

A

= +25 °C

T

A

= -55 to +125°C

--

--

±5
±7

LSB

Memory

4

All data sheets are subject to change without notice

©2001 Maxwell Technologies

All rights reserved.

12-Bit A/D Converter

7672

12.19.01 Rev 11

1000565

Bipolar Zero Error BZE TA = +25°C

T

A

= -55 to +125°C

--

--

±5
±6

LSB

Bipolar Gain Error BGE T

A

= +25°C

T

A

= -55 to +125°C

--

--

±5
±7

LSB

1. Guaranteed by design.

TABLE 5. 7672 TIMING CHARACTERISTICS

1,2

(VDD = 5V ±5%, VSS = -12V ±10%, V

REF

= -5V, TA = -55 TO 125 °C UNLESS OTHERWISE SPECIFIED)

1. 1LSB = FS/4096; T

A

= 25 °C; Performance over power supply tolerance is guaranteed by power supply rejection test.

2. All inputs are 0V to +5V swing with t

r

= tr = 5ns (10 to 90% of +5V) and timed from a voltage level of +1.6V.

P

ARAMETER TEST CONDITION SYMBOL MIN MAX UNITS

Conversion Time, Synchronous Clk,

3

3. Functionally tested.

12.5 clks, T

A

= -55 to +125 °C t

CONV

-- 5.0 us

-- 10

Conversion Time, Asynchronous Clk, 12-13 clks, T

A

= -55 to +125 °C t

CONV

4.8 5.2 us

9.6 10.4

CS

to RD Setup Time TA = -55 to +125 °C t

1

0--ns

RD

to BUSY Delay CL = 50 pF, TA = +25 °C

C

L

= 50 pF, TA = -55 to +125 °C

t

2

--

--

190
270

ns

Data Access Time

4

4. t3 and t6 are measured with the load circuits of Figure 1 and are defined as the time required for an output to cross +0.8 or
+2.4.

C

L

= 100 pF, TA = +25 °C

C

L

= 100 pF, TA = -55 to +125 °C

t

3

--

--

125
170

ns

RD

Pulse Width TA = -55 to +125 °C t

4

t

3

-- ns

CS

to RD Hold Time TA = -55 to +125 °C t

5

0--ns

Data Setup Time After BUSY

4

CL = 100 pF, TA = +25 °C
C

L

= 100 pF, TA = -55 to +125 °C

t

6

--

--

--

70

100

ns

Bus Relinguish Time

5

5. t7 is defined as the time required for the data lines to change 0.5V when loaded with the circuit of Figure 2.

(T

A

= +25 °C)

(-55 < T

A

< +125 °C)

t

7

--

--

75
90

ns

Delay Between Read Operations (-55 < T

A

< +125 °C) t

8

200 -- ns

TABLE 4. 7672 DC ELECTRICAL CHARACTERISTICS

(VDD = 5V ±5%, VSS = -12V ±10%, V

REF

= -5V, TA = -55 TO 125 °C UNLESS OTHERWISE SPECIFIED)

P

ARAMETER SYMBOL TEST CONDITION MIN MAX UNITS