AD640: 120 MHz, 50 dB Demodulating Logarithmic Amplifier
The AD640 is a complete monolithic logarithmic amplifier. A single AD640 provides up to 50 dB of dynamic range for frequencies from dc to 120 MHz. Two AD640s in cascade can provide up to 95 dB of ...More
AD640: 120 MHz, 50 dB Demodulating Logarithmic Amplifier
Product Description
The AD640 is a complete monolithic logarithmic amplifier. A single AD640 provides up to 50 dB of dynamic range for frequencies from dc to 120 MHz. Two AD640s in cascade can provide up to 95 dB of dynamic range at reduced bandwidth. The AD640 uses a successive detection scheme to provide an output current proportional to the logarithm of the input voltage. It is laser calibrated to close tolerances and maintains high accuracy over the full military temperature range using supply voltages from ±4.5 V to ±7.5 V.
The AD640 comprises five cascaded dc coupled amplifier/limiter stages, each having a small signal voltage gain of 10 dB and a -3 dB bandwidth of 350 MHz. Each stage has an associated full-wave detector, whose output current depends on the absolute value of its input voltage. The five outputs are summed to provide the video output (when low-pass filtered) scaled at 1 mA per decade (50 µA per dB). On chip resistors can be used to convert this output current to a voltage with several convenient slope options. A balanced signal output at +50 dB (referred to input) is provided to operate AD640s in cascade.
The logarithmic response is absolutely calibrated to within ±l dB for dc or square wave inputs from ±0.75 mV to ±200 mV,with an intercept (logarithmic offset) at 1 mV dc. An integral X10 attenuator provides an alternative input range of ±7.5 mV to ±2 V dc. Scaling is also guaranteed for sinusoidal inputs.
The AD640B is specified for the industrial temperature range of -40°C to +85°C and the AD640T, available processed to MIL-STD- 883B, for the military range of -55°C to +125°C. Both are available in 20-pin side brazed ceramic DIPs or leadless chip carriers (LCC). The AD640J is specified for the commercial temperature range of 0°C to +70°C, and is available in both 20-pin plastic DIP (N) and PLCC (P) packages.
This device is now available to Standard Military Drawing (DESC) number 5962-9095501MRA and 5962-9095501M2A.
An evaluation board is available for this product and may be ordered using the following product number: AD640-EB.
Applications
Features
- Complete, Fully Calibrated Monolithic System
- Five Stages, Each Having 10 dB Gain,
350 MHz BW - Direct Coupled Fully Differential Signal Path
- Logarithmic Slope, Intercept and AC Response are Stable Over Full Military Temperature Range
- Dual Polarity Current Outputs Scaled
1 mA/Decade - Voltage Slope Operation (1 V/Decade,
100 mV/dB, etc.) - Low Power Operation (Typically 220 mW at
±5 V) - Low Cost Plastic Packages Also Available
Diagrams
- Enlarge
- Обозначения и трафареты для печатной платы
Functional Block Diagram for AD640
120 MHz, 50 dB Demodulating Logarithmic Amplifier
Functional Block Diagram for AD640
| Part# | Product Description | RF Frequency (MHz) | Dynamic Range (dB) | Temp Stability (dB) | Response Time (ns typ) | Voltage Supply (V) | Supply Current (max) | Package | Price* (1000-4999) |
|---|---|---|---|---|---|---|---|---|---|
| AD606 | Limiter Output | - | 80 | - | 400 | 4.5 to 5.5 | 13 | 16-Lead DIP, 16-Lead SOIC | $22.00 |
| AD640 | Military Specified Part Available | - | 50 | ±1 | 10 | +/- 4.5 to +/- 7.5 | 44 | 20-Lead DIP, 20-Lead LCC, 20-Lead PLCC | $36.48 |
| AD641 | Military Specified Part Available | - | 44 | ±1 | 10 | +/- 4.5 to +/- 7.5 | 44 | 20-Lead DIP, 20-Lead LCC, 20-Lead PLCC | $32.82 |
| AD8302 | Dual-Channel Gain and Phase Outputs | 2,700 | 60 | ±1 | 60 | 2.7 to 5.5 | 19 | 14-Lead TSSOP | $12.14 |
| AD8306 | Military Specified Part Available | 5 to 400 | 100 | ±1 | 73 | 2.7 to 5.5 | 16 | 16-Lead SOP | $14.67 |
| AD8307 | High Dynamic Range | dc to 500 | 92 | ±1 | 400 | 2.7 to 5.5 | 8 | 8-Lead SOIC/DIP | $6.07 |
| AD8309 | Limiter Output | 5 to 500 | 100 | ±1 | 67 | 2.7 to 5.5 | 16 | 16-Lead TSSOP | $7.84 |
| AD8310 | High Dynamic Range | dc to 440 | 100 | ±1 | 15 | 2.7 to 5.5 | 8 | 8-Lead SOIC | $4.00 |
| AD8311 | Low Power for Battery Operation | 100 to 2500 | 50 | ±0.5 | 150 | 2.7 to 5.5 | 8.5 | WLCSP | $1.27 |
| AD8312 | Low Power for Battery Operation | 50 to 3500 | 45 | ±0.5 | 70 | 2.7 to 5.5 | 4.2 | WLCSP | $1.27 |
| AD8313 | Industry Standard | 100 to 2500 | 70 | ±1.25 | 40 | 2.7 to 5.5 | 14 | 8-Lead uSOIC | $7.99 |
| AD8314 | Industry Standard | 100 to 2700 | 45 | ±1 | 70 | 2.7 to 5.5 | 4.5 | 8-Lead uSOIC/CSP | $1.10 |
| AD8315 | Low Power for Battery Operation | 100 to 2500 | 50 | ±1 | 150 | 2.7 to 5.5 | 8.5 | 8-Lead uSOIC | $4.00 |
| AD8316 | Dual Output AD8315 | 100 to 2500 | 49 | ±1 | 50 | 2.7 to 5.5 | 8.5 | 16-Lead CSP | - |
| AD8317 | Available in Die | 1 to 10000 | 55 | ±0.5 | 6 | 3 to 5.5 | 20 | 8-Lead CSP | $3.98 |
| AD8318 | Integrated Temp Sensor | 1 to 8000 | 70 | ±0.5 | 10 | 4.5 to 5.5 | 68 | 16-Lead CSP | $5.05 |
| AD8319 | Pin-compatible with AD8317 | 1 to 10000 | 45 | ±0.5 | 6 | 3 to 5.5 | 22 | 8-Lead CSP | $1.77 |
| ADL5513 | 125°C Operation, Broadband | 1 to 4000 | 80 | ±0.5 | 10 | 2.7 to 5.5 | - | 16-Lead CSP | - |
| ADL5519 | Dual-Channel AD8317 | 1 kHz to 10000 | 62 | ±0.5 | 6 | 3 to 5.5 | 56 | 32-Lead LFCSP | $5.04 |
* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S.
Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.
AD640 Model Options
Help
Close- "Pre-Release": модель микросхемы еще не запущена в серийное производство, однако можно получить образцы.
- Производство: модель производится, доступна для покупки и заказа образцов.
- Завершение продаж: запланировано снятие модели микросхемы с производства, но в течение некоторого ограниченного времени покупка еще возможна.
- Снято с производства: Микросхема снята с производства и не доступна для приобретения. Другие варианты, указанные в таблице, все еще производятся (если их статус любой, кроме "снято с производства")
Для более подробного описания корпуса и материалов - см. Package Site
- Коммерческое исполнение: 0…70°С
- Военное исполнение: от -55 до +125 градусов по Цельсию
- Индустриальное исполнение: диапазоны рабочих температур могут быть разные у разных моделей. См. техническое описание (datasheet)
- Automotive: -40 to +125 °С
Приведенные цены действительны в США и указаны только для примерного бюджетного рассчета. Цены указаны в долларах США (за штуку в указанном размере партии) и могут быть изменены. Цены в других регионах могут отличаться в зависимости от местных пошлин, налогов, сборов и курсов валют. Для уточнения стоимости обращайтесь в местные офисы продаж Analog Devices, или к официальным дистрибьюторам. Цены на оценочные платы и наборы указаны за штуку независимо от количества.