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Analog Devices Inc. AD608AR
- Part No.:
- AD608AR
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Mixers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD608AR.pdf
- Description:
- IC MIXER 500MHZ DOWN CONV 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,367
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Product details
Overview
AD608AR from Analog Devices is a monolithic 3 V receiver IF subsystem integrating a low-power mixer, logarithmic/limiting amplifier, and high-speed RSSI output. It delivers 24 dB mixer conversion gain, 110 dB limiting gain, and 80 dB RSSI dynamic range with ±1 dB logarithmic conformance from −75 dBm to +5 dBm input at 10.7 MHz - enabling compact, battery-powered RF receivers for PHS/GSM/TDMA systems.
For engineers reviewing the AD608AR datasheet, AD608AR pinout, AD608AR application, or AD608AR equivalent, this page provides verified circuit role (IF subsystem with integrated mixer + limiter + RSSI), supply range (2.7–5.5 V), power consumption (21 mW at 3 V), phase stability (±3° over 80 dB), and functional validation against industrial temperature specs (−40°C to +85°C).
Technical Context
The AD608AR implements a doubly balanced Gilbert-cell mixer with −15 dBm 1 dB compression and −5 dBm IP3, driven by an on-chip LO preamplifier requiring only −16 dBm drive. Its IF path comprises five 16 dB gain stages feeding a final hard-limiting stage and seven full-wave rectifier cells for successive-detection RSSI generation.
RSSI output is derived from a two-pole postdemodulation LPF (2 MHz cutoff), delivering 0.2 V to 1.8 V (20 mV/dB nominal slope) with 200 ns response time; limiter output is 400 mV p-p with 11 ns rise/fall times and ±3° phase stability across −75 dBm to +5 dBm at 10.7 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Mixer Conversion Gain | 24 dB typical into 165 Ω load - enables direct drive of standard 330 Ω parallel-terminated 10.7 MHz SAW filters without external gain staging |
| 1 dB Compression Point | −15 dBm - defines upper linear RF input limit for distortion-sensitive IF sampling |
| Third-Order Intercept (IP3) | −5 dBm - quantifies intermodulation resilience in multi-channel RF environments |
| RSSI Dynamic Range | 80 dB (−75 dBm to +5 dBm) with ±1 dB accuracy - supports precise signal strength measurement across cellular and wireless receiver AGC loops |
| Limiter Output | 400 mV p-p into 5 kΩ - provides stable, jitter-controlled hard-limited IF for FM demodulation or clock recovery |
| Power Consumption | 21 mW at 3 V (7.3 mA) - enables operation in portable instrumentation with CMOS-compatible power-down to 300 μW |
| Phase Stability | ±3° over 80 dB input range at 10.7 MHz - ensures consistent demodulator timing alignment across signal amplitude variations |
Pinout & Package
The AD608AR is housed in a 16-lead plastic SOIC (SOIC_N, JEDEC MS-012-AC, package option R-16) with 1.27 mm pitch and thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VPS1, VPS2 | Positive supply inputs | Dual supply pins supporting independent biasing of mixer (VPS1) and limiter (VPS2); collectively referenced as VPOS |
| PRUP | CMOS logic enable input | Active-high control with 200 ns enable/disable time; drives internal power-up sequencing and standby current reduction to 300 μW |
| RFHI / RFLO | Differential RF input | High-impedance differential port (1.9 kΩ || 3 pF at 100 MHz) accepting −95 dBm to −15 dBm signals up to 500 MHz |
| LOHI | Single-ended LO input | Accepts −16 dBm LO drive; internally preamplified to drive mixer core |
| MXOP | Mixer output | Current-output node driving external 330 Ω IF filter; ±6 mA max output limits load impedance selection per gain equation GdB = 20 log10(0.0961 × RL) |
| IFHI / IFLO | Differential IF input to logarithmic amplifier | Accepts −75 dBm to +15 dBm IF signals up to 30 MHz; dc-coupled with offset-null feedback via FDBK pin |
| LMOP | Limiter output | Hard-limited 400 mV p-p signal with 200 Ω output impedance; suitable for direct connection to FM discriminators or clock recovery circuits |
| RSSI | RSSI voltage output | 0.2 V to 1.8 V analog voltage proportional to input power (20 mV/dB at 3 V); requires no external scaling for ADC interfacing |
| FDBK | Offset-null feedback output | Drives external π-network (R/C) to null dc offset in high-gain IF chain; critical for maintaining RSSI accuracy below −65 dBm |
| VMID | Midsupply bias reference | Provides VPOS/2 reference for IF amplifier biasing; used to center limiter and RSSI output swings |
Key Features
| Feature | Design Value |
|---|---|
| Integrated mixer + limiter + RSSI | Reduces BOM count and PCB area in IF strips by consolidating three critical RF functions into one 16-pin SOIC |
| Successive-detection RSSI architecture | Seven full-wave rectifier cells deliver 80 dB dynamic range with <200 ns response and <±1 dB error from −75 dBm to +5 dBm |
| CMOS-compatible power-down | Reduces supply current from 7.3 mA to 100 μA in 400 ns, enabling rapid duty-cycled operation in battery-powered receivers |
| On-chip LO preamplifier | Eliminates need for external LO buffer; accepts −16 dBm drive to achieve full mixer linearity and gain |
| Sub-microvolt input offset nulling | Feedback loop automatically corrects input offset to <1 μV, preserving RSSI accuracy across temperature and supply variation |
Applications
| PHS/GSM Receiver Front-End | Battery-Powered RSSI Instrumentation |
|---|---|
Use Scenario: Down-converting 240 MHz SAW-filtered RF to 10.7 MHz IF in handheld PHS/GSM transceivers with tight power budgets. IC Role / Device Role / Timing Role: Mixer provides 24 dB gain and −5 dBm IP3; limiter delivers 400 mV p-p hard-limited IF; RSSI supplies AGC voltage with ±3° phase stability. Use Value: Enables single-chip IF solution meeting GSM spectral mask and PHS sensitivity requirements while consuming only 21 mW at 3 V. |
Use Scenario: Measuring received signal strength in portable spectrum analyzers or field test equipment operating from coin-cell batteries. IC Role / Device Role / Timing Role: AD608AR acts as self-contained IF detector with 80 dB RSSI range and 200 ns response, eliminating external log amps and comparators. Use Value: Delivers calibrated 0.2–1.8 V RSSI output directly compatible with 10-bit ADCs, reducing system latency and component count. |
| Base Station Signal Monitoring | Narrowband FM Demodulation |
Use Scenario: Real-time RSSI monitoring across multiple channels in cellular base station diversity receivers. IC Role / Device Role / Timing Role: AD608AR's dual supply pins (VPS1/VPS2) allow independent power control per channel; RSSI output tracks supply variation to minimize calibration drift. Use Value: Provides traceable, temperature-stable RSSI data across −40°C to +85°C with no external compensation components required. |
Use Scenario: Driving ceramic discriminator in 455 kHz narrowband FM receivers for land-mobile radio or telemetry links. IC Role / Device Role / Timing Role: Limiter output supplies clean 400 mV p-p signal to discriminator; RSSI feeds squelch control; VMID sets bias point for IF amplification. Use Value: Eliminates discrete limiter and detector stages, achieving ±3° phase stability and <1 dB RSSI error across full IF input range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar IF subsystem applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX2623EUA+ | Integrated VCO + PLL + mixer; no built-in limiter or RSSI; 2.7–5.5 V supply; 12.5 mA typical current | Targets frequency synthesis and local oscillator generation, not IF detection or signal strength measurement | Select MAX2623EUA+ only when VCO/PLL functionality is required alongside mixing - not as a drop-in replacement for AD608AR's RSSI/limiter functions |
| LT5534ES6#TRMPBF | RF logarithmic detector only (no mixer or limiter); 40 dB dynamic range; 3.3 V supply; 5.5 mA current | Designed for RF power measurement at antenna ports, not IF strip integration or FM demodulation support | Choose LT5534ES6#TRMPBF for standalone RF power detection where IF gain, limiting, and phase stability are unnecessary |
Compared with MAX2623EUA+ and LT5534ES6#TRMPBF, the AD608AR uniquely integrates mixer, limiter, and RSSI in one SOIC package with verified 80 dB dynamic range, ±3° phase stability, and 21 mW 3 V operation - making it irreplaceable for compact, low-power IF subsystems requiring all three functions simultaneously.
Availability
AD608AR is available at Aetrix Electronics and suitable for PHS/GSM receiver front-ends, battery-powered RSSI instrumentation, and base station signal monitoring requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for AD608AR 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and a legacy of precision RF IC innovation since 1965.
The AD608AR belongs to Analog Devices' RF receiver IF subsystem product line, engineered specifically for low-power, high-dynamic-range wireless receivers in cellular, PHS, and telemetry applications where integration, phase stability, and RSSI accuracy are critical.
FAQ
What is the operating supply voltage range for the AD608AR?
The AD608AR operates from a single 2.7 V to 5.5 V supply across −25°C to +85°C, and from 3.0 V to 5.5 V across the extended industrial range of −40°C to +85°C. Both VPS1 and VPS2 pins must be biased within this range; the device draws 7.3 mA typical at 3 V, consuming 21 mW. The RSSI output slope scales linearly with supply voltage, enabling ratiometric ADC interfacing without external references.
How does the AD608AR achieve ±3° phase stability over its 80 dB input range?
The AD608AR achieves ±3° phase stability from −75 dBm to +5 dBm at 10.7 MHz through a fully dc-coupled, five-stage logarithmic IF amplifier with tightly matched gain cells and a final hard-limiting stage. This architecture minimizes phase shift variation across amplitude changes, which is critical for FM demodulation and coherent detection. The stability is validated across temperature and supply voltage per the Rev. C datasheet specifications.
Can the AD608AR drive a standard 330 Ω 10.7 MHz ceramic filter directly?
Yes - the AD608AR's MXOP pin is designed to drive a parallel-terminated 330 Ω 10.7 MHz band-pass filter, presenting a 165 Ω effective load that yields the specified 24 dB mixer conversion gain. The datasheet confirms this configuration in Figure 24 and Table 6, specifying 330 Ω termination resistors on both input and output sides of the filter for optimal performance and minimal insertion loss.
What is the purpose of the FDBK pin on the AD608AR?
The FDBK pin on the AD608AR outputs current pulses from the limiter stage to drive an external π-network (R/C filter), which generates a dc correction voltage applied to the IF amplifier's inverting input (IFLO). This closed-loop offset-nulling system reduces input offset to sub-microvolt levels, ensuring RSSI accuracy remains within ±1 dB down to −75 dBm - a requirement unmet by open-loop log amps.
Does the AD608AR support IF frequencies other than 10.7 MHz?
Yes - the AD608AR's IF amplifier handles signals from low frequency up to 30 MHz, and application circuits in the datasheet validate operation at 450 kHz, 455 kHz, and 6.5 MHz. For sub-MHz IFs, an external low-pass filter (e.g., single-pole at 90 kHz) is required to suppress ripple; Table 6 provides resistor/capacitor values for offset-null feedback networks optimized per IF.
AD608AR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- AD608
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- RF Type:
- FM, GSM, PM, PHS, FM
- Frequency:
- 500MHz
- Number of Mixers:
- 1
- Gain:
- 24dB
- Noise Figure:
- 16dB
- Secondary Attributes:
- Down Converter
- Current - Supply:
- 7.3mA
- Voltage - Supply:
- 2.7V ~ 5.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
AD608AR FAQ
1.How can I place an order for AD608AR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD608AR 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 AD608AR reliable?
The price and inventory of AD608AR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD608AR is usually 5 days.
3.What payment methods are accepted for AD608AR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD608AR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD608AR?
AD608AR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD608AR 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 AD608AR?
For technical support, including AD608AR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD608AR requirements.
6.How does Aetrix verify that AD608AR is sourced from the original manufacturer or authorized distributors?
All AD608AR 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 AD608AR meets industry standards.
7.What is the process for return or replacement of AD608AR?
All AD608AR units undergo pre-shipment inspection (PSI). If there is an issue with AD608AR, 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 AD608AR part is unused and in its original packaging.
Return procedure for AD608AR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD608AR Tags
-
MAX2671EUT+T
Analog Devices Inc./Maxim Integrated
-
ADEX-10+
Mini-Circuits
-
ADE-2+
Mini-Circuits
-
ADE-1+
Mini-Circuits
-
LT5560EDD#PBF
Analog Devices Inc.
-
LT5560EDD#TRPBF
Analog Devices Inc.
-
LTC5562IUC#TRPBF
Analog Devices Inc.
-
MAX2681EUT+T
Analog Devices Inc./Maxim Integrated
-
ADE-1ASK+
Mini-Circuits
-
ADE-1L+
Mini-Circuits
-
ADL5350ACPZ-R7
Analog Devices Inc.
-
AD608ARZ-RL
Analog Devices Inc.
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