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Part Name(s) : ML2008 ML2009 ML2008IP ML2008IQ ML2008CP ML2008CQ ML2009IP ML2009IQ ML2009CP ML2009CQ Micro-Linear
Micro Linear Corporation
Description : µP Compatible LOGARITHMIC GAIN/ATTENUATOR

GENERAL DESCRIPTION
The ML2008 and ML2009 are digitally controlled LOGARITHMIC GAIN/ATTENUATORs with a range of –24 to +24dB in 0.1dB steps.
Easy interface to microprocessors is provided by an input latch and control signals consisting of chip select and write.

FEATURES
■ Low noise 0dBrnc max with +24dB gain
■ Low harmonic distortion –60dB max
■ Gain range –24 to +24dB
■ Resolution 0.1dB steps
■ Flat frequency response ±0.05dB from 0.3-4kHz ±0.10dB from 0.1-20kHz
■ Low supply current 4mA max from ±5V supplies
■ TTL/CMOS compatible digital interface
■ ML2008 is designed to interface to an 8-bit data bus; ML2009 to 16-bit data bus

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Part Name(s) : ML2003 ML2003C ML2003CP ML2003CQ ML2003CX ML2003I ML2003IQ ML2003IX ML2004 ML2004C ML2004CP ML2004CX ML2004I ML2004IP ML2004IX Fairchild
Fairchild Semiconductor
Description : LOGARITHMIC GAIN/ATTENUATOR

General Description
The ML2003 and ML2004 are digitally controlled logarith mic GAIN/ATTENUATORs with a range of –24 to +24 dB in 0.1 dB steps.
The gain settings are selected by a 9-bit digital word. The ML2003 digital interface is either parallel or serial. The ML2004 is packaged in a 14-pin DIP with a serial interface only.

Features
• Low noise: 0 dBrnc max with +24dB gain
• Low harmonic distortion: -60dB max
• Gain range: –24 to +24dB
• Resolution: 0.1dB steps
• Flat frequency response:
±0.05dB from .3–4 kHz
±0.10dB from .1-20 kHz
• Low supply current 4mA max from ±5V supplies
• TTL/CMOS compatible digital interface
• ML2003 has pin selectable serial or parallel interface;
   ML2004 serial interface only

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Part Name(s) : ML2003 ML2003CP ML2003CQ ML2003IP ML2003IQ ML2004 ML2004CP ML2004IP Micro-Linear
Micro Linear Corporation
Description : LOGARITHMIC GAIN/ATTENUATOR
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Part Name(s) : TDA8783M Philips
Philips Electronics
Description : True LOGARITHMIC amplifier

GENERAL DESCRIPTION
The TDA8780M is a true LOGARITHMIC amplifier intended for dynamic range reduction of IF signals at 10.7 MHz in digital radio receivers. It offers true LOGARITHMIC characteristics over a 72 dB input dynamic range, has a small-signal gain-adjustment facility and a constant limiting output voltage for large input levels.

FEATURES
• 72 dB true LOGARITHMIC dynamic range
• Small-signal gain-adjustment facility
• Constant limiting output voltage
• Temperature and DC power supply voltage independent
• Easy interfacing to analog-to-digital converters
• Output DC level shift facility.

APPLICATIONS
• Dynamic range compression
• IF signal dynamic range reduction in digital receivers
• Compression receivers.

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Part Name(s) : DS1800 DS1800E DS1800S Dallas
Dallas Semiconductor -> Maxim Integrated
Description : Dual Inverting Log GAIN/ATTENUATOR

DESCRIPTION
The DS1800 is a dual audio-taper potentiometer designed specifically for use in the feedback path of the inverting configuration of an operational amplifier (see Figure 2). In this configuration, the DS1800 provides a VO /VI relationship of -20log(RF/RI), giving a gain/attenuation range covering +20 dB to -63 dB. Each potentiometer has a total of 129 positions including mute. The DS1800 provides five areas of resolution, which include: 0.25 dB per step from +20 dB to +3 dB; 0.5 dB per step from +3 dB to -12 dB; 1 dB from -12 dB to -27 dB; 2 dB per step from -27 dB to -47 dB; and 4 dB per step from -47 dB to -63 dB. The mute position provides 100 dB of attenuation.

FEATURES
■ Ultra-low power consumption
■ Operates from 3V or 5V supplies
■ Two digitally controlled, 128-position potentiometers including mute
LOGARITHMIC gain characteristics
■ Zero-crossing detection eliminates noise caused by discrete wiper changes
■ Two control interfaces
   - 3-wire serial CPU control
   - Pushbutton control
■ 20-pin DIP (300-mil), 20-pin SOIV (300-mil), and 20-pin (173-mil) TSSOP packaging available
■ Operating Temperature Range:
   - Industrial: -40°C to +85°C
■ Software and hardware mute
■ Standard Resistance Available: 53KΩ

 

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Part Name(s) : NTE1792 NTE-Electronic
NTE Electronics
Description : Integrated Circuit Dual Attenuator

Description:
The NTE1792 is a silicon monolithic integrated circuit in a 9–Lead SIP package designed for sound control applications.

Features:
• Two separate attenuators
• The characteristic control curve is linear against LOGARITHMIC output.
• Channel Separation: 64dB MIN
• Typical Application: Sound MPX attenuator for TV, Radio and mobile receiver.

 

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Part Name(s) : U4314B U4314B-AFP Temic
Temic Semiconductors
Description : LOGARITHMIC AM Demodulator / RSSI

Description
The U4314B is a monolithic Integrated Circuit in bipolar technology for low current super-heterodyne receivers. It can be used as a LOGARITHMIC Received Signal Strength Indicator (RSSI) or as a LOGARITHMIC AM demodulator. Its bandwidth is optimized for intermediate frequencies of 9 to 10.7 MHz (see figure 9).

Features
LOGARITHMIC RSSI / AM demodulator output
Sensitive  IF-amplifier for 10.7 MHz operating frequency
Usable for ASK data systems up to several hundred kBauds
Extreme low current consumption typically 0.8 mA
Wide power supply voltage range 3 to 12 V
Temperature compensated reference voltage of 2.4 V externally available
Only one additional part (capacitor) necessary
ESD hardened

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Part Name(s) : UM9552 UM9552S Microsemi
Microsemi Corporation
Description : PIN DIODE ATTENUATOR

Description
The UM9552 is a very long minority carrier lifetime (70 ms typical) PIN DIODE that has been developed for low HF or LF Band Attenuator Applications. They have been evaluated for attenuator linearity and distortion characteristics in a Bridge Tee Attenuator Circuit at 455 KHz (the common intermediate frequency for AM transmitters and receivers). When the UM9552’s are used as the two variable resistors in the Bridged Tee Circuit, the Third Order Intermodulation Products are below -60 dBc with 0 dBm input power over an attenuation range of 4 dB to 30 dB.
These thicker, longer lifetime PIN diodes exhibit a more linear forward biased resistance (RS) vs forward bias current (If) relationship, which greatly simplifies the design of the driver circuits that supply the bias currents over the specified attenuation range. This task is simplified if the low attenuation range is truncated and the few dB are compensated by commercially available, inexpensive 4 to 6 dB gain blocks.

Features
● Low Frequency Attenuator
● HF/LF Band Operation
● Long Lifetime (70 ms typ.)
● Very Low Distortion (IP3 @ 455 KHz = < 60 dBm)

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Part Name(s) : TL441 TL441CN TL441CNE4 TL441CNSR TL441CNSRE4 TL441CNSRG4 TL441N TI
Texas Instruments
Description : LOGARITHMIC AMPLIFIER

description
This amplifier circuit contains four 30-dB LOGARITHMIC stages. Gain in each stage is such that the output of each stage is proportional to the logarithm of the input voltage over the 30-dB input voltage range. Each half of the circuit contains two of these 30-dB stages summed together in one differential output that is proportional to the sum of the logarithms of the input voltages of the two stages. The four stages may be interconnected to obtain a theoretical input voltage range of 120-dB. In practice, this permits the input voltage range typically to be greater than 80-dB with log linearity of ± 0.5-dB (see application data). Bandwidth is from dc to 40 MHz.
This circuit is useful in data compression and analog compensation. This LOGARITHMIC amplifier is used in log IF circuitry as well as video and log amplifiers.
The TL441 is characterized for operation over 0°C to 70°C.

• Excellent Dynamic Range
• Wide Bandwidth
• Built-In Temperature Compensation
• Log Linearity (30-dB Sections) . . . 1 dB Typ
• Wide Input Voltage Range

 

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Part Name(s) : UM9301 UM9301SM Microsemi
Microsemi Corporation
Description : Commercial Attenuator Diode

DESCRIPTION
The UM9301 PIN Diode utilizes special overall chip geometry with an extremely thick intrinsic “I” region, to offer unique capabilities in both RF switch and attenuator applications. Volume production also makes the diode an economical choice suitable for many commercial low power equipments. The UM9301 has been designed for use
in bridged TEE attenuator circuits commonly utilized for gain and slope control in CATV amplifiers.

KEY FEATURES
Specified low distortion
Low distortion properties at low reverse bias
Resistance specified at 3 current points
High reliability fused-in-glass construction

APPLICATIONS/BENEFIT
Little or no Bias required.
Operates as low as 2MHZ.
Available in leaded or surface mount packages.

 

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