7846ARPFS_技术文档

7846A

16-Bit Digital to Analog Converter

V_CC

21

V_DD

4

V_REF+

7

R

6

5

R_IN

R

-

+

A2

16

-

+

V_OUT

A3

Segment

Switch

Matrix

12-bit DAC

12

-

+

A1

23

22

CS

V_REF-

7846A

8

DAC Latch

4

R/W

Control

Logic

12

25 LDAC

24 CLR

I/O Latch

9

10

3

20

V_SS

DB15

DB0

DGND

Logic Diagram

FEATURES:

DESCRIPTION:

• RAD-PAK® technology-hardened against natural

space radiation

Maxwell Technologies’ 7846A 16-Bit DAC converter microcir-

cuit features a greater than 100 krad (Si) total dose tolerance,

• Total dose hardness:

depending upon space mission. The 7846A has V

and

REF+

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

• Excellent Single Event Effects

V_REF-reference inputs and an on-chip output amplifier which

gives the option of unipolar or bipolar output. The 7846A uses

a segmented architecture. The 4 MSBs in the DAC latch

select one of the segments in a 16-resistor string. Both taps of

the segment are buffered by amplifiers and fed to a 12-bit

DAC, which provides a further 12 bits of resolution. This archi-

tecture ensures 16-bit monotonicity. Excellent integral linearity

results from tight matching between the input offset voltages

of the two buffer amplifiers. In addition to the excellent accu-

racy specifications, the 7846A also offers a comprehensive

microprocessor interface. There are 16 data I/O pins, plus

control lines (CS, R/W, LDAC and CLR). R/W and CS have

readback function which allows writing to and reading from the

I/O latch.

- SEL > 114 MeV/mg/cm²

TH

- SEU < 8 MeV/mg/cm²

• Package:

-28 pin R^AD-PAK® Flat Pack

• Microprocessor compatible with readback capability

• 16-Bit monotonicity over temperature

• ±2 LSBs integral linearity error

• Unipolar or bipolar output

• Multiplying capability

• Low power (100 mW typical)

Maxwell Technologies' patented R^AD-PAK® packaging technol-

ogy incorporates radiation shielding in the microcircuit pack-

age. 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.

05.29.03 REV 5

1

All data sheets are subject to change without notice

(619) 503-3300 - Fax: (619) 503-3301- www.maxwell.com

16-Bit Digital to Analog Converter

7846A

TABLE 1. 7846A PINOUT DESCRIPTION

SYMBOL

DESCRIPTION

1-3

4

DB2-DB0

Data I/O pins. DB0 is LSB.

Positive supply for analog circuitry. This is +15V nominal.

DAC output voltage pin.

V

DD

5

V

OUT

6

R_IN

Input to summing resistor of DAC output amplifier. This is used

to select output voltage ranges.

7

8

V

_REF+Input. The DAC is specified for V_REF+= +5V.

REF+

V

V_REF-Input. For unipolar operation connect V_REF-to 0V and for

REF-

bipolar operation connect it to -5V. The device is specified for

both conditions.

9

10-19

20

V

Negative supply for the analog circuitry. This is -15V nominal.

Data I/O pins. DB15 is MSB.

SS

DB15-DB6

DGND

Ground pin for digital circuitry.

21

V

Positive supply for digital circuitry. This is +5V nominal.

CC

22

R/W

R/W Input. This can be used to load data to the DAC or to read

back the DAC latch contents.

23

24

CS

Chip select input. This selects the device.

CLR

Clear Input. The DAC can be cleared to 000...000 or

100...000.

25

LDAC

Asynchronous load input to DAC.

Data I/O pins.

26-28

DB5-DB3

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16-Bit Digital to Analog Converter

7846A

1

TABLE 2. 7846A ABSOLUTE MAXIMUM RATINGS

P^ARAMETER

_DDto DGND

_CCto DGND

MIN

MAX

UNIT

V

-0.3

+17

V

V_DD+0.3 or 7

(Whichever Is Lower)

V to DGND

-17

-25

-0.3

+0.3

+25

V

SS

V

_REF+to DGND

_REF-to DGND

_OUTto DGND ²

V

R to DGND

IN

Digital Input Voltage to DGND

Digital Output Voltage to DGND

V_CC+0.3

V +0.3

CC

Power Dissipation

To +75 ^°C

Derates above +75 ^°C

1000

10

mW

mW/^°C

Thermal Inpedance

2.78

°C

Θ_JC

-55

Operating Temperature Range

Storage Temperature Range

+125

+150

^°C

-65

1. Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress

rating only and functional operation of the device at these or any other conditions above those indicated in the operational sec-

tions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may

affect device reliability. Only one absolute maximum rating may be applied at any one time.

2. V_OUTmay be shorted to DGND, V , V and V_CCprovided that the power dissipation of the package is not exceeded.

DD SS

TABLE 3. DELTA LIMITS

PARAMETER

VARIATION

I_DD

I_EE

I_CC

±10% of value specified in Table 4.

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16-Bit Digital to Analog Converter

7846A

1

TABLE 4. 7846A ELECTRICAL SPECIFICATIONS

(VDD=+15V ±5%; VSS=-15V ±5%; V_CC= +5 V ±5%, T_A= -55 TO +125°C)

T =-55 ^°C TO +125

A

P^ARAMETER

Resolution

TEST CONDITIONS/COMMENTS

SUBGROUPS

U^NIT

Bits

^°C

16

UNIPOLAR OUTPUT

Relative Accuracy @ 25 ^°C

- T_MINto T_MAX

Differential Nonlinearity Error

Gain Error @ 25 ^°C

- T_MINto T_MAX

Offset Error @ 25 ^°C

- T_MINto T_MAX

Gain TC ²

Offset TC ²

V_REF-=0V, V_OUT=0V to +10V

1LSB=153µV

1

2, 3

1

2,3

1

2,3

1

±16

±1

±12

±24

±12

±24

±2

LSB typ

LSB max

LSB typ

LSB max

Guaranteed Monotonic

V_OUTLoad= 10MΩ

LSB typ

LSB max

ppm FSR/°C typ

±2

BIPOLAR OUTPUT

Relative Accuracy @ 25 ^°C

- T_MINto T_MAX

V_REF-=-5V, V_OUT=-10V to +10V

1LSB=305µV

1

2, 3

1

2, 3

1

2, 3

1

2, 3

1

±6

±8

±1

±6

±16

±6

±16

±6

±16

±2

LSB typ

LSB max

LSB typ

LSB max

LSB typ

LSB max

LSB typ

LSB max

Differential Nonlinearity Error

Gain Error @ 25 ^°C

- T_MINto T_MAX

Guaranteed Monotonic

V_OUTLoad=10MΩ

Offset Error @ 25 ^°C

- T_MINto T_MAX

V_OUTLoad=10MΩ

Bipolar Zero Error @ 25 ^°C

- T_MINto T_MAX

Gain TC ²

ppm FSR/^°C typ

Offset TC ²

Bipolar Zero TC ²

REFERENCE INPUT

Input Resistance

Resistance from V_REF-to V

Typically 30kΩ

1, 2, 3

20

40

^KΩ min

^KΩ max

V

REF+

V_REF+Range

V + 6 to V_DD- 6

SS

V_REF-Range

V

SS

OUTPUT CHARACTERISTICS

Output Voltage Swing

Resistive Load¹

Capacitive Load³

Output Resistance

V + 4 to V_DD- 3

V max

^kΩ min

pF max

Ω typ

SS

To 0V

3

1000

0.3

Short Circuit Current

To 0V or Any Power Supply

±25

mA typ

DIGITAL INPUTS

V (Input High Voltage)

1, 2, 3

2.4

0.8

±10

10

V min

V max

µAmax

pF max

IH

V (Input Low Voltage)

IL

I (Input Current)

IN

C_IN(Input Capacitance) ²

DIGITAL OUTPUTS

V (Output Low Voltage)

I_SINK= 1.6mA

_SOURCE= 400µA

DB0-DB15 = 0 to V

0.4

4.0

±10

10

V max

V min

µAmax

pF max

OL

V_OH(Output High Voltage)

I

Floating State Leakage Current

Floating State Output Capacitance ²

CC

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16-Bit Digital to Analog Converter

7846A

1

TABLE 4. 7846A ELECTRICAL SPECIFICATIONS

(VDD=+15V ±5%; VSS=-15V ±5%; V_CC= +5 V ±5%, T_A= -55 TO +125°C)

T =-55 ^°C TO +125

A

P^ARAMETER

TEST CONDITIONS/COMMENTS

SUBGROUPS

U^NIT

^°C

POWER REQUIREMENTS ⁴

V

1, 2, 3

+11.4/+15.75

-11.4/-15.75

+4.75/+5.25

V min/V max

mA max

DD

V

SS

V

CC

I_DD

I_SS

V

_OUTUnloaded

5

V_OUTUnloaded

mA max

I_CC

1

2

100

mA max

LSB/V max

mW typ

Power Supply Sensitivity ⁵

Power Dissipation

V_OUTUnloaded

^{1. Minimum load is 3k}Ω.

2. Sample tested to ensure compliance.

3. Maximum load is 1000pF.

4. 7846ARP is functional with power supplies of ±12V. See typical performance curves.

5. Sensitivity to Gain Error, Offset Error and Bipolar Zero Error to V , V variations.

DD SS

6. Guaranteed by design

1

TABLE 5. 7846A AC PERFORMANCE CHARACTERISTICS

(VDD=+15V ±5%; VSS=-15V ±5%; V_CC= +5 V ±5%, T_A= -55 TO +125°C)

T_A=25^°C

T_A=T_MINTO T_MAX

P^ARAMETER

TEST CONDITIONS

UNIT

Output Settling Time

To 0.006% FSR. V_OUTloaded. V_REF-=0V.

To 0.003% FSR. V_OUTloaded. V_REF-=-5V.

7

9

7

9

µs max

Digital-to-Analog Glitch DAC alternately loaded with 10…0000 and

400

nV-secs typ

Impulse

01…1111. V_OUTunloaded.

AC Feed through

V

_REF-=0V, V_REF+=1V rms, 10kHz sine wave.

0.5

10

50

0.5

10

50

mV pk-pk typ

nV-secs typ

DAC loaded with all 0s.

Digital Feed through

DAC alternately loaded with all 1s and all

0s. CS High.

½

Output Noise Voltage

Density

Measured at V . DAC loaded with

0111011…11.

nV/(Hz) typ

OUT

(1kHz-100kHz)

V_REF+=V_REF-=0V.

1. Guaranteed by design.

05.29.03 REV 5

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5

16-Bit Digital to Analog Converter

7846A

1,2,3,4

TABLE 6. 7846A TIMING CHARACTERISTICS

(V_DD= +14.25V TO 15.75V; V = -14.25V TO -15.75V; V_CC= 4.75 TO 5.25V; UNLESS OTHERWISE SPECIFIED)

SS

LIMIT AT

P^ARAMETER

TEST CONDITIONS/COMMENTS

U^NIT

T =-55 ^°C TO +125 ^°C

A

t₁

t₂

t₃

t₄

t₅

t₆

t₇

R/W to CS Setup Time

CS Pulse Width (Write Cycle)

R/W to CS Hold Time

Data Setup Time

50

190

50

ns min

ns max

ns min

ns max

ns min

120

0

Data Hold Time

Data Access Time

320

10

Bus Relinquish Time

90

t₈

CLR Setup Time

20

t₉

CLR Pulse Width

150

0

t₁₀

t₁₁

t₁₂

CLR Hold Time

LDAC Pulse Width

CS Pulse Width (Read Cycle)

100

330

1. Guaranteed by design. All input control signals are specified with t_R= t_F= 5ns (10% to 90% of +5V) and timed from a voltage

level of 1.6V.

2. t₆is measured with the load circuits of Figure 1 and defined as the time required for an output to cross 0.8V or 2.4V.

3. t₇is defined as the time required for an output to change 0.5V when loaded with the circuits of Figure 2. Specifications subject to

change without notice.

4. See Figure 3 on page 7.

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16-Bit Digital to Analog Converter

7846A

FIGURE 1. LOAD CIRCUITS FOR ACCESS TIME (t₆)

F^IGURE2. LOAD CIRCUITS FOR BUS RELINQUISH TIME (t₇)

FIGURE 3. 16-BIT DIGITAL TO ANALOG CONVERTER

t₃

t₁

t₃

t

₁

R./W

CS

5V

0V

t₁₂

t₂

5V

0V

t

₇

t₅

t₄

t₆

5V

0V

5V

DATA

CLR

Data Valid

t

₈

t₉

t₈

t

₉

t₁₀

0V

5V

t₁₁

LDAC

0V

05.29.03 REV 5

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7

16-Bit Digital to Analog Converter

7846A

05.29.03 REV 5

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8

16-Bit Digital to Analog Converter

7846A

28 PIN RAD-PAK® FLAT PACKAGE

DIMENSION

SYMBOL

MIN

NOM

MAX

A

b

0.190

0.015

0.004

--

0.207

0.017

0.005

0.720

0.410

--

0.224

0.022

0.009

0.740

0.420

0.440

--

c

D

E

0.380

--

E1

E2

E3

e

0.180

0.030

0.250

0.080

0.050 BSC

0.370

0.073

0.027

28

--

L

0.360

0.062

0.000

0.380

0.081

--

Q

S1

N

F28-02

Note: All dimensions in inches

05.29.03 REV 5

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16-Bit Digital to Analog Converter

7846A

Important Notice:

These data sheets are created using the chip manufacturers published specifications. Maxwell Technologies verifies

functionality by testing key parameters either by 100% testing, sample testing or characterization.

The specifications presented within these data sheets represent the latest and most accurate information available to

date. However, these specifications are subject to change without notice and Maxwell Technologies assumes no

responsibility for the use of this information.

Maxwell Technologies’ products are not authorized for use as critical components in life support devices or systems

without express written approval from Maxwell Technologies.

Any claim against Maxwell Technologies must be made within 90 days from the date of shipment from Maxwell Tech-

nologies. Maxwell Technologies’ liability shall be limited to replacement of defective parts.

05.29.03 REV 5

All data sheets are subject to change without notice 10

16-Bit Digital to Analog Converter

7846A

Product Ordering Options

Model Number

7846A

RP

F

X

Option Details

Feature

Monolithic

Screening Flow

S = Maxwell Class S

B = Maxwell Class B

I = Industrial (testing @ -55°C,

+25°C, +125°C)

E = Engineering (testing @ +25°C)

F = Flat Pack

Package

RP = R^AD-PAK® package

Radiation Feature

16-Bit Digital to Analog Converter

Base Product

Nomenclature

05.29.03 REV 5

All data sheets are subject to change without notice 11


型号：	7846ARPFS
厂家：	MAXWELL TECHNOLOGIES
描述：	16-Bit Digital to Analog Converter 16位数模转换器转换器数模转换器
文件：	总11页 (文件大小：258K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

7846ARPFS [MAXWELL]

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