AD7111ACR-REEL

AD7111ACR-REEL Datasheet

FEATURES Dynamic Range dB Resolution dB On-Chip Data Latches +5 V Operation AD7111A Pin Compatible with AD7524 Low Power

Part	Datasheet
AD7111ACR-REEL	AD7111ACR-REEL (pdf)

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FEATURES Dynamic Range dB Resolution dB On-Chip Data Latches +5 V Operation AD7111A Pin Compatible with AD7524 Low Power APPLICATIONS Audio Attenuators Sonar Systems Function Generators Digitally Controlled AGC System LC2MOS LOGDAC Logarithmic D/A Converter AD7111/AD7111A FUNCTIONAL BLOCK DIAGRAMS AD7111 17-BIT DAC RFB I OUT AGND 17-BIT LATCH DECODE LOGIC GENERAL DESCRIPTION The AD7111/AD7111A are monolithic multiplying D/A converters featuring wide dynamic range in a small package. Both DACs can attenuate an analog input signal over the range 0 dB to dB in dB steps. They are available in 16-pin DIPs and SOIC packages. The AD7111 is also available in a 20-terminal LCCC package. The degree of attenuation across the DAC is determined by an 8-bit word applied to the onboard decode logic. This 8-bit word is decoded into a 17-bit word which is then applied to a 17-bit R-2R ladder. The very fine step resolution, which is available over the entire dynamic range, is due to the use of this 17-bit DAC. The AD7111/AD7111A are easily interfaced to a standard 8-bit MPU bus via an 8-bit data port and standard microprocessor control lines. The AD7111 WR input is edge triggered and requires a rising edge to load new data to the DAC. The AD7111A WR is level triggered to allow transparent operation of the latches, if required. It should also be noted that the AD7111A is exactly pin and function-compatible with the AD7524, an industry standard 8-bit multiplying DAC. This allows an easy upgrading of existing AD7524 designs which would benefit both from the wider dynamic range and the finer step resolution offered by the AD7111A. The AD7111/AD7111A are fabricated in Linear Compatible CMOS LC2MOS , an advanced, mixed technology process that combines precision bipolar circuits with low power CMOS logic. LOGDAC is a registered trademark of Analog Devices, Inc. CONTROL LOGIC 8-BIT BUFFER D0 D7 AD7111A 17-BIT DAC DGND RFB I OUT AGND 17-BIT LATCH DECODE LOGIC CONTROL LOGIC 8-BIT BUFFER D0 D7 DGND PRODUCT HIGHLIGHTS Wide Dynamic Range 0 dB to dB attenuation range in dB steps. Small Package The AD7111/AD7111A are available in 16-pin DIPs and SOIC packages. Transparent Latch Operation By tying the CS and WR inputs low, the DAC latches in the AD7111A can be made transparent. Fast Microprocessor Interface Data setup times of 25 ns and write pulse width of 57 ns make the AD7111A compatible with modern microprocessors. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel 617/329-4700 Fax 617/326-8703 CHARACTERISTICS VDD = +5 V, VIN = V dc, IOUT = AGND = DGND = O V output amplifier AD711 except where noted Parameter NOMINAL RESOLUTION ORDERING GUIDES AD7111 ORDERING GUIDE AD7111A ORDERING GUIDE Model AD7111ABN AD7111ACN AD7111ABR AD7111ACR Temperature Range to +85°C to +85°C to +85°C to +85°C NOTE 1N = Plastic DIP R = SOIC. Specified Accuracy Range 0 dB to 60 dB 0 dB to 72 dB 0 dB to 60 dB 0 dB to 72 dB Package Option1 N-16 N-16 R-16 R-16 Specified Modell Temperature Range Accuracy Range Package Option2 AD7111KN 0°C to +70°C 0 dB to 60 dB N-16 AD7111BQ to +85°C 0 dB to 60 dB Q-16 AD7111LN 0°C to +70°C 0 dB to 72 dB N-16 AD7111CQ to +85°C 0 dB to 72 dB Q-16 AD7111UQ/883B to +125°C 0 dB to 72 dB Q-16 AD7111TE/883B to +125°C 0 dB to 60 dB E-20A NOTES 1To order MIL-STD-883B, Class B processed parts, add /883B to part number. Contact local sales office for military data sheet and availability. 2N = Plastic DIP Q = Cerdip E = LCCC R = SOIC. TERMINOLOGY RESOLUTION Nominal change in attenuation when moving between two adjacent codes. MONOTONICITY The device is monotonic if the analog output decreases or remains constant as the digital code increases. FEEDTHROUGH ERROR That portion of the input signal which reaches the output when all digital inputs are high. See section on Applications. OUTPUT LEAKAGE CURRENT which appears on the IOUT terminal with all digital inputs high. TOTAL HARMONIC DISTORTION A measure of the harmonics introduced by the circuit when a pure sinusoid is applied to the input. It is expressed as the harmonic energy divided by the fundamental energy at the output. ACCURACY The difference measured in dB between the ideal transfer function as listed in Table I and the actual transfer function as measured with the device. OUTPUT CAPACITANCE from IOUT to ground. DIGITAL-TO-ANALOG GLITCH IMPULSE The amount of charge injected from the digital inputs to the analog output when the inputs change state. This is normally specified as the area of the glitch in either pA-secs or nV-secs depending upon whether the glitch is measured as a current or voltage signal. Glitch impulse is measured with VIN = AGND. PROPAGATION DELAY This is a measure of the internal delays of the circuit and is defined as the time from a digital input change to the analog output current reaching 90% of its final value. AD7111/AD7111A PIN CONFIGURATIONS DIP/SOIC LCCC

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FEATURES Dynamic Range dB Resolution dB On-Chip Data Latches +5 V Operation AD7111A Pin Compatible with AD7524 Low Power

APPLICATIONS Audio Attenuators Sonar Systems Function Generators Digitally Controlled AGC System

LC2MOS LOGDAC Logarithmic D/A Converter

AD7111/AD7111A

FUNCTIONAL BLOCK DIAGRAMS

AD7111
17-BIT DAC

RFB I OUT AGND
17-BIT LATCH

DECODE LOGIC

GENERAL DESCRIPTION The AD7111/AD7111A are monolithic multiplying D/A converters featuring wide dynamic range in a small package. Both DACs can attenuate an analog input signal over the range 0 dB to dB in dB steps. They are available in 16-pin DIPs and SOIC packages. The AD7111 is also available in a 20-terminal LCCC package.

The degree of attenuation across the DAC is determined by an 8-bit word applied to the onboard decode logic. This 8-bit word is decoded into a 17-bit word which is then applied to a 17-bit R-2R ladder. The very fine step resolution, which is available over the entire dynamic range, is due to the use of this 17-bit DAC.

The AD7111/AD7111A are easily interfaced to a standard 8-bit MPU bus via an 8-bit data port and standard microprocessor control lines. The AD7111 WR input is edge triggered and requires a rising edge to load new data to the DAC. The AD7111A WR is level triggered to allow transparent operation of the latches, if required. It should also be noted that the AD7111A is exactly pin and function-compatible with the AD7524, an industry standard 8-bit multiplying DAC. This allows an easy upgrading of existing AD7524 designs which would benefit both from the wider dynamic range and the finer step resolution offered by the AD7111A.

The AD7111/AD7111A are fabricated in Linear Compatible CMOS LC2MOS , an advanced, mixed technology process that combines precision bipolar circuits with low power CMOS logic.

LOGDAC is a registered trademark of Analog Devices, Inc.

CONTROL LOGIC
8-BIT BUFFER

D0 D7

AD7111A
17-BIT DAC

DGND

RFB I OUT AGND
17-BIT LATCH

DECODE LOGIC

CONTROL LOGIC
8-BIT BUFFER

D0 D7

DGND

PRODUCT HIGHLIGHTS Wide Dynamic Range 0 dB to dB attenuation range in
dB steps.

Small Package The AD7111/AD7111A are available in 16-pin DIPs and SOIC packages.

Transparent Latch Operation By tying the CS and WR inputs low, the DAC latches in the AD7111A can be made transparent.

Fast Microprocessor Interface Data setup times of 25 ns and write pulse width of 57 ns make the AD7111A compatible with modern microprocessors.

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel 617/329-4700

Fax 617/326-8703

CHARACTERISTICS

VDD = +5 V, VIN = V dc, IOUT = AGND = DGND = O V output amplifier AD711 except where noted

Parameter

NOMINAL RESOLUTION
ORDERING GUIDES
AD7111 ORDERING GUIDE
AD7111A ORDERING GUIDE

Model

AD7111ABN AD7111ACN AD7111ABR AD7111ACR

Temperature

Range
to +85°C to +85°C to +85°C to +85°C

NOTE 1N = Plastic DIP R = SOIC.

Specified Accuracy Range
0 dB to 60 dB 0 dB to 72 dB 0 dB to 60 dB 0 dB to 72 dB

Package Option1

N-16 N-16 R-16 R-16

Specified

Modell

Temperature Range

Accuracy Range

Package Option2

AD7111KN
0°C to +70°C 0 dB to 60 dB N-16

AD7111BQ
to +85°C 0 dB to 60 dB Q-16

AD7111LN
0°C to +70°C 0 dB to 72 dB N-16

AD7111CQ
to +85°C 0 dB to 72 dB Q-16

AD7111UQ/883B to +125°C 0 dB to 72 dB Q-16

AD7111TE/883B to +125°C 0 dB to 60 dB E-20A

NOTES 1To order MIL-STD-883B, Class B processed parts, add /883B to part number.

Contact local sales office for military data sheet and availability. 2N = Plastic DIP Q = Cerdip E = LCCC R = SOIC.

TERMINOLOGY RESOLUTION Nominal change in attenuation when moving between two adjacent codes.

MONOTONICITY The device is monotonic if the analog output decreases or remains constant as the digital code increases.

FEEDTHROUGH ERROR That portion of the input signal which reaches the output when all digital inputs are high. See section on Applications.

OUTPUT LEAKAGE CURRENT which appears on the IOUT terminal with all digital inputs high.

TOTAL HARMONIC DISTORTION A measure of the harmonics introduced by the circuit when a pure sinusoid is applied to the input. It is expressed as the harmonic energy divided by the fundamental energy at the output.

ACCURACY The difference measured in dB between the ideal transfer function as listed in Table I and the actual transfer function as measured with the device.

OUTPUT CAPACITANCE from IOUT to ground.

DIGITAL-TO-ANALOG GLITCH IMPULSE The amount of charge injected from the digital inputs to the analog output when the inputs change state. This is normally specified as the area of the glitch in either pA-secs or nV-secs depending upon whether the glitch is measured as a current or voltage signal. Glitch impulse is measured with VIN = AGND.

PROPAGATION DELAY This is a measure of the internal delays of the circuit and is defined as the time from a digital input change to the analog output current reaching 90% of its final value.

AD7111/AD7111A

PIN CONFIGURATIONS

DIP/SOIC

LCCC

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Datasheet ID: AD7111ACR-REEL 517724