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Analog Devices Inc. AD640TE/883B
- Part No.:
- AD640TE/883B
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-CLCC
- Datasheet:
-
AD640TE/883B.pdf
- Description:
- IC LOGARITHMIC 1 CIRCUIT 20LCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,287
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Product details
Overview
AD640TE/883B from Analog Devices is a military-grade, fully calibrated monolithic logarithmic amplifier optimized for precision RF and IF signal compression in radar, sonar, and instrumentation systems. It delivers 50 dB dynamic range (dc to 120 MHz), five cascaded 10 dB amplifier/limiter stages with 350 MHz per-stage bandwidth, dual-polarity current outputs scaled at 1 mA/decade, and absolute calibration within ±1 dB over –55°C to +125°C.
For engineers reviewing the AD640TE/883B datasheet, AD640TE/883B pinout, AD640TE/883B application, or AD640TE/883B equivalent, this page provides verified military-spec performance data, validated pin functions, confirmed temperature-stable logarithmic transfer characteristics, and real-world cascade configuration guidance for high-accuracy wideband signal measurement.
Technical Context
The AD640TE/883B implements a successive-detection architecture using five dc-coupled, fully differential amplifier/limiter stages-each with 10 dB small-signal gain and 350 MHz –3 dB bandwidth-feeding dedicated full-wave transconductance detectors. Its logarithmic output current (Pin 14) is laser-trimmed to deliver 1 mA/decade scaling with intercept voltage VX = 0.99 mV (typ) across –55°C to +125°C.
Internal bias regulators stabilize gain, slope (IY = 1.00 mA ±2% over temp), and intercept against supply variation (±4.5 V to ±7.5 V) and temperature drift; the on-chip 20 dB attenuator (Pins 2–5, 19) enables extended input range (±7.5 mV to ±2 V) with guaranteed intercept stability when Pin 8 (ITC) is grounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Dynamic Range | 50 dB (dc to 120 MHz); supports precise amplitude measurement of weak and strong signals without clipping or saturation. |
| Logarithmic Slope | 1.00 mA/decade (±2% over –55°C to +125°C); enables direct current-mode output scaling for voltage conversion via external 1 kΩ resistor. |
| Intercept Voltage | 0.99 mV (typ), ±0.10 mV over temp; defines zero-log reference point; stable to ±0.5 µV/°C with internal compensation. |
| Bandwidth (Full System) | 145 MHz (Pins 1/20 to 10/11); ensures accurate log response up to L-band RF frequencies with minimal phase distortion. |
| Input Offset Voltage | 50 µV (max 200 µV); preserves accuracy for sub-millivolt dc and low-level ac inputs in precision instrumentation. |
| Power Dissipation | 220 mW (typ at ±65 V); low quiescent current (9 mA on +VS, 35 mA on –VS) enables compact thermal design in sealed military enclosures. |
| Attenuator Range | 20 dB (Pins 5→19); extends usable input range to ±2 V while maintaining ±1.5 dB total absolute accuracy with ITC disabled. |
Pinout & Package
AD640TE/883B is supplied in a 20-lead side-brazed ceramic DIP (SBDIP) package rated for military temperature operation (–55°C to +125°C) and hermetic reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 20 | SIG+IN / SIG–IN | Differential signal input pair; 500 kΩ input resistance, ±0.3 V common-mode range; accepts dc-coupled RF/IF signals. |
| 2, 3, 4, 5, 19 | ATN IN / ATN LO / ATN COM / ATN OUT | On-chip 20 dB attenuator network; enables ±2 V input range with temperature-stable intercept when Pin 8 grounded. |
| 7, 12 | –VS / +VS | Split analog supplies; operate from ±4.5 V to ±7.5 V; require local decoupling due to 44 mA total quiescent current. |
| 8 | ITC | Internal temperature compensation control; grounding disables ITC bias for attenuator-mode intercept stability. |
| 10, 11 | SIG+OUT / SIG–OUT | Differential limited signal output; ±180 mV peak, 75 Ω output impedance; used to cascade multiple AD640s for 95 dB range. |
| 13, 14 | LOG COM / LOG OUT | Complementary logarithmic current outputs; 1 mA/decade scaling; Pin 14 sinks current proportional to log|VIN|. |
| 15, 16, 17 | RG0, RG1, RG2 | Access points for internal 1 kΩ slope-setting resistors; support 0.5 V/dec to 2 V/dec voltage output configurations. |
| 18 | BL2 | Bias line 2; connects to internal slope bias regulator; must be left unconnected or tied to appropriate reference per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential dc-coupled signal path | Eliminates interstage coupling capacitors; enables subsonic (<20 Hz) and RF signal processing in same device with no ground-loop instability. |
| Laser-trimmed absolute calibration | ±1 dB accuracy from ±0.75 mV to ±200 mV dc input; eliminates system-level recalibration across military temperature range. |
| On-chip 20 dB attenuator with PTAT trim | Shifts intercept to 10 mV dc with <±0.3%/°C TC; guarantees full 50 dB dynamic range stability from –55°C to +125°C. |
| Dual polarity logarithmic outputs | Pin 14 (LOG OUT) and Pin 13 (LOG COM) provide complementary 1 mA/decade currents; enable differential current summing for cascaded configurations. |
| Integrated slope and intercept bias regulators | Compensate for transistor parameter spread, supply drift, and temperature; maintain ±0.002%/°C slope stability and ±0.5 µV/°C intercept drift. |
Applications
| Radar Pulse Compression | Sonar Signal Conditioning |
|---|---|
Use Scenario: Measuring amplitude of short-duration RF pulses (e.g., airborne fire-control radar) across >60 dB input swing while preserving timing integrity. IC Role / Device Role / Timing Role: Logarithmic amplifier providing instantaneous amplitude-to-current conversion with 120 MHz bandwidth and <10 ns thermal recovery. Use Value: Enables detection of weak return echoes immediately following high-power transmit bursts without "tail" distortion or baseline shift. | Use Scenario: Converting underwater acoustic pressure waveforms (1 kHz–100 kHz) into linear-in-dB voltage for beamforming and target classification. IC Role / Device Role / Timing Role: DC-coupled logarithmic front-end delivering stable 50 dB dynamic range with <0.5 dB linearity error from 1 mV to 100 mV input. Use Value: Eliminates need for AGC loops or programmable gain stages, reducing latency and component count in towed-array receivers. |
| RF Power Measurement | Electronic Warfare Receiver Front-End |
Use Scenario: Calibrated RF power sensing in field-deployable test equipment measuring –75 dBm to +15 dBm signals across 10 kHz–120 MHz. IC Role / Device Role / Timing Role: Absolute-calibrated logarithmic detector with traceable ±1 dB accuracy referenced to 1 mV intercept and 1 mA/decade slope. Use Value: Replaces multi-stage hybrid log amps; achieves NIST-traceable power measurement without external calibration at each use temperature. | Use Scenario: Wideband IF signal compression in channelized receiver systems detecting threat emitters across L/S/C bands with rapid pulse repetition. IC Role / Device Role / Timing Role: Cascadable logarithmic amplifier stage (two AD640TE/883B yield 95 dB range at reduced bandwidth) feeding ADC or envelope detector. Use Value: Maintains consistent log slope and intercept across –55°C to +125°C, enabling reliable amplitude sorting and emitter identification in harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar logarithmic amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8307ARZ | Single-supply (2.7–5.5 V), 500 MHz bandwidth, 92 dB dynamic range, voltage output (2.5 V/dec), no internal attenuator. | Optimized for handheld spectrum analyzers and battery-powered RF detectors; lacks military temp rating and hermetic packaging. | Select AD8307ARZ only for commercial portable instruments requiring wider bandwidth and lower supply voltage-not for MIL-STD-883B compliance or hermetic reliability. |
| LT5537ESC6#TRPBF | 3 GHz bandwidth, 60 dB range, 3.3 V supply, integrated detector + buffer, no dc coupling, ±2.5°C temp drift on intercept. | Targeted at microwave communications monitoring; requires external ac-coupling and cannot process sub-10 kHz signals or dc offsets. | Choose LT5537ESC6#TRPBF for >1 GHz RF monitoring where dc response and military temp stability are not required. |
Compared with AD8307ARZ and LT5537ESC6#TRPBF, the AD640TE/883B uniquely combines dc coupling, absolute calibration over –55°C to +125°C, hermetic SBDIP packaging, and on-chip 20 dB attenuator-making it the only option for precision, wide-temperature, wide-dynamic-range logarithmic measurement in defense electronics.
Availability
AD640TE/883B is available at Aetrix Electronics and suitable for radar pulse compression, sonar signal conditioning, RF power measurement, and electronic warfare receiver front-end applications requiring stable component supply under MIL-STD-883B qualification.
Supply support for AD640TE/883B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD640 product line was designed specifically for precision wideband logarithmic amplification in military and aerospace instrumentation-emphasizing absolute calibration, temperature stability, and cascade-ready signal interfaces.
FAQ
What is the guaranteed operating temperature range for AD640TE/883B?
The AD640TE/883B is processed to MIL-STD-883B and specified for continuous operation from –55°C to +125°C. All electrical parameters-including logarithmic slope (1.00 mA/decade), intercept voltage (0.99 mV), and bandwidth (145 MHz)-are guaranteed across this full military temperature range, with no derating required.
How does the on-chip attenuator affect the intercept voltage of AD640TE/883B?
When the on-chip 20 dB attenuator is used (input applied to Pins 2–5, 19), the intercept voltage shifts from 1 mV to 10 mV dc. This shift is laser-trimmed and stabilized with a +0.30%/°C temperature coefficient, ensuring ±1.5 dB total absolute accuracy from –55°C to +125°C-provided Pin 8 (ITC) is grounded to disable internal temperature compensation bias.
Can AD640TE/883B be cascaded with another AD640TE/883B for extended dynamic range?
Yes, two AD640TE/883B devices can be cascaded using the differential signal outputs (Pins 10/11) of the first stage to drive the inputs (Pins 1/20) of the second. This configuration delivers up to 95 dB dynamic range at reduced bandwidth (≈60 MHz), with intercept stability maintained by grounding Pin 8 on the second AD640TE/883B and applying offset nulling per Figure 27 of the datasheet.
What is the purpose of Pin 8 (ITC) on AD640TE/883B, and how should it be configured?
Pin 8 (ITC) controls internal temperature compensation for the logarithmic intercept. When left open or floating, ITC is enabled for standard input range operation (±0.75 mV to ±200 mV). When grounded, ITC is disabled-required for stable intercept performance when using the on-chip 20 dB attenuator to extend input range to ±2 V.
Does AD640TE/883B support true dc-coupled operation, and what is its minimum input frequency?
Yes, AD640TE/883B features a fully dc-coupled signal path with no internal blocking capacitors. It supports true dc input signals and operates down to 0 Hz-enabling precise logarithmic conversion of subsonic, audio, and slowly varying IF signals without baseline shift or low-frequency roll-off.
AD640TE/883B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-CLCC
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Logarithmic
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 350 MHz
- Current - Input Bias:
- 7 µA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 35mA
- Current - Output / Channel:
- 2.3 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 15 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-CLCC (9x9)
AD640TE/883B FAQ
1.How can I place an order for AD640TE/883B through Aetrix?
Please submit a Request for Quotation (RFQ) for AD640TE/883B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD640TE/883B reliable?
The price and inventory of AD640TE/883B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD640TE/883B is usually 5 days.
3.What payment methods are accepted for AD640TE/883B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD640TE/883B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD640TE/883B?
AD640TE/883B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD640TE/883B order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD640TE/883B?
For technical support, including AD640TE/883B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD640TE/883B requirements.
6.How does Aetrix verify that AD640TE/883B is sourced from the original manufacturer or authorized distributors?
All AD640TE/883B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD640TE/883B meets industry standards.
7.What is the process for return or replacement of AD640TE/883B?
All AD640TE/883B units undergo pre-shipment inspection (PSI). If there is an issue with AD640TE/883B, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD640TE/883B part is unused and in its original packaging.
Return procedure for AD640TE/883B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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