AD7945BR Datasheet AD7945BRSZ-REEL, AD7945ARSZ-B, AD7943ARSZ-B | P7-P9

AD7943/AD7945/AD7948

REV. B –7–

ORDERING GUIDE

Temperature Linearity Nominal Package

Model Range Error (LSBs) Supply Voltage Option

AD7943BN –40°C to +85°C ±0.5 +5 V N-16

AD7943BR –40°C to +85°C ±0.5 +5 V R-16

AD7943BRS –40°C to +85°C ±0.5 +5 V RS-20

AD7943AN-B –40°C to +85°C ±1 +3.3 V to +5 V N-16

AD7943ARS-B –40°C to +85°C ±1 +3.3 V to +5 V RS-20

AD7945BN –40°C to +85°C ±0.5 +5 V N-20

AD7945BR –40°C to +85°C ±0.5 +5 V R-20

AD7945BRS –40°C to +85°C ±0.5 +5 V RS-20

AD7945AN-B –40°C to +85°C ±1 +3.3 V to +5 V N-20

AD7945ARS-B –40°C to +85°C ±1 +3.3 V to +5 V RS-20

AD7945TQ –55°C to +125°C ±1 +5 V Q-20

AD7948BN –40°C to +85°C ±0.5 +5 V N-20

AD7948BR –40°C to +85°C ±0.5 +5 V R-20

AD7948BRS –40°C to +85°C ±0.5 +5 V RS-20

AD7948AN-B –40°C to +85°C ±1 +3.3 V to +5 V N-20

AD7948ARS-B –40°C to +85°C ±1 +3.3 V to +5 V RS-20

NOTE

N = Plastic DIP; R = SOP (Small Outline Package); RS = SSOP (Shrink Small Outline Package); Q = Cerdip.

ABSOLUTE MAXIMUM RATINGS

= +25°C unless otherwise noted)

to DGND . . . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to +6 V

OUT1

to DGND . . . . . . . . . . . . . . . . . . . –0.3 V to V

+ 0.3 V

OUT2

to DGND . . . . . . . . . . . . . . . . . . . –0.3 V to V

+ 0.3 V

AGND to DGND . . . . . . . . . . . . . . . . . –0.3 V to V

+ 0.3 V

Digital Input Voltage to DGND . . . . . . –0.3 V to V

+ 0.3 V

RFB

, V

REF

to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . ±15 V

Input Current to Any Pin Except Supplies

. . . . . . . . ±10 mA

Operating Temperature Range

Industrial (A, B Versions) . . . . . . . . . . . . . –40°C to +85°C

Extended (T Version) . . . . . . . . . . . . . . . –55°C to +125°C

Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C

Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . +150°C

DIP Package, Power Dissipation . . . . . . . . . . . . . . . . 670 mW

Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 116°C/W

Lead Temperature, Soldering, (10 sec) . . . . . . . . . . +260°C

SOP Package, Power Dissipation . . . . . . . . . . . . . . . . . 450 mW

Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 75°C/W

Lead Temperature, Soldering

Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . +215°C

Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C

SSOP Package, Power Dissipation . . . . . . . . . . . . . . . . 875 mW

Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 132°C/W

Lead Temperature, Soldering

Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . +215°C

Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C

NOTES

Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the

device at these or any other conditions above those listed in the operational sections

of this specification is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

Transient currents of up to 100 mA will not cause SCR latch-up.

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection.

Although the AD7943/AD7945/AD7948 feature proprietary ESD protection circuitry, perma-

nent damage may occur on devices subjected to high energy electrostatic discharges. Therefore,

proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

AD7943/AD7945/AD7948

REV. B–8–

TERMINOLOGY

Relative Accuracy

Relative Accuracy or endpoint linearity is a measure of the

maximum deviation from a straight line passing through the

endpoints of the DAC transfer function. It is measured after

adjusting for zero error and full-scale error and is normally

expressed in Least Significant Bits or as a percentage of full-

scale reading.

Differential Nonlinearity

Differential nonlinearity is the difference between the measured

change and the ideal 1 LSB change between any two adjacent

codes. A specified differential nonlinearity of 1 LSB maximum

ensures monotonicity.

Gain Error

Gain Error is a measure of the output error between an ideal

DAC and the actual device output. It is measured with all 1s

in the DAC after offset error has been adjusted out and is ex-

pressed in Least Significant Bits. Gain error is adjustable to

zero with an external potentiometer.

Output Leakage Current

Output leakage current is current which flows in the DAC lad-

der switches when these are turned off. For the I

OUT1

terminal,

it can be measured by loading all 0s to the DAC and measuring

the I

OUT1

current. Minimum current will flow in the I

OUT2

line

when the DAC is loaded with all 1s.

Output Capacitance

This is the capacitance from the I

OUT1

pin to AGND.

Output Voltage Settling Time

This is the amount of time it takes for the output to settle to a

specified level for a full-scale input change. For these devices, it

is specified both with the AD843 as the output op amp in the

normal current mode and with the AD820 in the biased current

mode.

Digital to Analog Glitch Impulse

This is the amount of charge injected into the analog output

when the inputs change state. It is specified as the area of the

glitch in nV-s. It is measured with the reference input connected

to AGND and the digital inputs toggled between all 1s and all

0s. As with Settling Time, it is specified with both the AD817

and the AD820.

AC Feedthrough Error

This is the error due to capacitive feedthrough from the DAC

reference input to the DAC I

OUT1

terminal, when all 0s are

loaded in the DAC.

Digital Feedthrough

When the device is not selected, high frequency logic activity on

the device digital inputs is capacitively coupled through the

device to show up as noise on the I

OUT1

pin and subsequently on

the op amp output. This noise is digital feedthrough.

PIN CONFIGURATIONS

DIP/SOP SSOP DIP/SOP/SSOP DIP/SOP/SSOP

TOP VIEW

(Not to Scale)

AD7945

DB5

DB6

DB7

AGND

DGND

DB11

DB8

DB9

DB10

DB4

DB3

DB2

REF

DB1

DB0

OUT1

TOP VIEW

(Not to Scale)

AD7943

OUT1

OUT2

AGND

STB1

LD1

SRO

SRI

STB2

REF

CLR

DGND

STB4

STB3

LD2

TOP VIEW

(Not to Scale)

AD7943

NC = NO CONNECT

STB2

SRI

SRO

OUT2

AGND

STB1

LD1

LD2

STB3

STB4

REF

CLR

DGND

OUT1

TOP VIEW

(Not to Scale)

AD7948

DB4

DB5

DB6

AGND

DGND

CSMSB

DB7 (MSB)

CTRL

DF/DOR

DB3

DB2

DB1

REF

DB0 (LSB)

LDAC

CSLSB

OUT1

AD7943/AD7945/AD7948

REV. B –9–

AD7943 PIN FUNCTION DESCRIPTIONS

Pin Mnemonic Description

OUT1

DAC current output terminal 1.

OUT2

DAC current output terminal 2. This should be connected to the AGND pin.

AGND This pin connects to the back gates of the current steering switches. In normal operation, it should be connected

to the signal ground of the system. In biased single-supply operation it may be biased to some voltage between

0 V and the 1.23 V. See Figure 11 for more details.

STB1 This is the Strobe 1 input. Data is clocked into the input shift register on the rising edge of this signal. STB3

must be high. STB2, STB4 must be low.

LD1, LD2 Active low inputs. When both of these are low, the DAC register is updated and the output will change to

reflect this.

SRI Serial Data Input. Data on this line will be clocked into the input shift register on one of the Strobe inputs,

when they are enabled.

STB2 This is the Strobe 2 input. Data is clocked into the input shift register on the rising edge of this signal.

STB3 must be high. STB1, STB4 must be low.

STB3 This is the Strobe 3 input. Data is clocked into the input shift register on the falling edge of this signal. STB1,

STB2, STB4, must be low.

STB4 This is the Strobe 4 input. Data is clocked into the input shift register on the rising edge of this signal. STB3

must be high. STB1, STB2 must be low.

DGND Digital Ground.

CLR Asynchronous CLR input. When this input is taken low, all 0s are loaded to the DAC latch.

Power supply input. This is nominally +5 V for Normal Mode Operation and +3.3 V to +5 V for Biased

Mode Operation.

REF

DAC reference input.

DAC feedback resistor pin.

AD7945 PIN FUNCTION DESCRIPTIONS

Pin Mnemonic Description

OUT1

DAC current output terminal 1.

AGND This pin connects to the back gates of the current steering switches. The DAC I

OUT2

terminal is also connected

internally to this point.

DGND Digital Ground.

DB11–DB0 Digital Data Inputs.

CS Active Low, Chip Select Input.

WR Active Low, Write Input.

Power supply input. This is nominally +5 V for Normal Mode Operation and +3.3 V to +5 V for Biased Mode

Operation.

REF

DAC reference input.

DAC feedback resistor pin.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P16

AD7945BR

Mfr. #:

Buy AD7945BR

Manufacturer:

Analog Devices Inc.

Description:

Digital to Analog Converters - DAC 3.3V/5V Multiplying 12-Bit Parallel IF

Lifecycle:

New from this manufacturer.

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AD7945BR

AD7945BR

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