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Analog Devices Inc. AD9861BCP-50
- Part No.:
- AD9861BCP-50
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Front End (LNA + PA)
- Package:
- 64-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD9861BCP-50.pdf
- Description:
- IC FRONT-END MIXED SGNL 64-LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:797
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Product details
Overview
AD9861BCP-50 from Analog Devices is a mixed-signal front-end (MxFE™) baseband transceiver integrating dual 10-bit ADCs (50 MSPS max), dual 10-bit DACs (200 MSPS), programmable PLL, and 20-bit flexible I/O interface in a single 64-lead LFCSP package. It serves as the analog-digital bridge in broadband access modems, enabling simultaneous high-fidelity signal digitization and synthesis with independent Rx/Tx power-down control.
For engineers reviewing the AD9861BCP-50 datasheet, AD9861BCP-50 pinout, AD9861BCP-50 application, or AD9861BCP-50 equivalent, key selection considerations include its 50 MSPS ADC sampling rate, 200 MSPS DAC update capability, 3.3 V dual-supply operation, 64-lead LFCSP thermal performance, and support for half-duplex (HD10/HD20) and full-duplex data transfer modes.
Technical Context
The AD9861BCP-50 implements a fully integrated timing generation block with a user-programmable PLL that derives all internal clocks-including ADC and DAC clocks-from a single CLKIN reference. Its dual ADC path features internal 1.0 V reference, 30 MHz input bandwidth, and configurable low-power operating modes (normal/low/ultralow) scaling current from 103 mA to 28 mA at 50 MSPS.
The transmit path includes 2×/4× bypassable interpolation filters, programmable TxPGA gain (20 dB range, 0.1 dB steps), and differential current-output DACs (IOUT±A/B) with 20 mA full-scale capability and ±0.1% offset mismatch. Three auxiliary converter pins support system-level monitoring or control voltage generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 10-bit-enables 9.6 ENOB at 10 MHz input, sufficient for DOCSIS 2.0/3.0 upstream channel digitization. |
| Max ADC Sample Rate | 50 MSPS-optimized for cable modem upstream bandwidths up to 20 MHz with Nyquist margin. |
| DAC Update Rate | 200 MSPS-supports 4× interpolated baseband signals up to 50 MHz output bandwidth. |
| Full-Scale Output Current | 20 mA-drives 100 Ω differential loads directly without external amplification in typical FTTx line cards. |
| Power Consumption (Rx @ 50 MSPS) | 103 mA AVDD current-balances dynamic performance and thermal density in space-constrained PCMCIA-sized designs. |
| Package | 64-lead LFCSP (9 mm × 9 mm, 0.9 mm height)-enables high-density layout in broadband LAN modules and DSLAM line cards. |
| Operating Temperature | –40°C to +85°C-qualified for industrial-grade deployment in outdoor broadband access nodes. |
Pinout & Package
AD9861BCP-50 uses a 64-lead LFCSP (Low Profile Fine-Pitch Chip Scale Package) with exposed thermal pad requiring solder connection to ground plane per datasheet Figure 3 and Table 8.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKIN (Pin 48) | System Clock Input | Single reference clock source for internal PLL; supports 1–200 MHz input when PLL bypassed. |
| VIN+A / VIN–A (Pins 57/58) | ADC A Differential Input | Accepts 2 V p-p differential analog signal; 2 kΩ input resistance enables direct connection to RF front-end filters. |
| IOUT+A / IOUT–A (Pins 8/9) | DAC A Differential Output | Current-mode output; requires external 50 Ω termination per leg to generate 1 V p-p differential voltage swing. |
| RxPwrDwn (Pin 62) | Rx Analog Power-Down Control | Active-low digital input enabling dynamic power gating of ADC path-reduces current from 103 mA to 5 mA. |
| U9–U0 / L9–L0 (Pins 19–28, 35–44) | Upper/Lower Data Bus | 20-bit bidirectional I/O supporting HD10 (interleaved 10-bit), HD20 (parallel 20-bit), or FD (full-duplex interleaved) transfers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 10-bit ADCs with internal reference | Eliminates external reference IC and decoupling components-reducing BOM count and PCB area in cost-sensitive modems. |
| Programmable TxPGA gain (20 dB, 0.1 dB steps) | Enables precise amplitude calibration across multiple channels without trimming resistors or DAC reprogramming. |
| Configurable power modes (normal/low/ultralow) | Reduces ADC current from 103 mA to 28 mA at 16 MSPS-extending battery life in portable test equipment or low-power gateways. |
| Three auxiliary converters (AUX_ADC/AUX_DAC) | Provides on-chip system monitoring (e.g., temperature, supply voltage) or bias control (e.g., VGA gain setting) without adding discrete ADC/DAC. |
| Flexible 20-bit I/O interface | Supports HD20 (20-bit parallel), HD10 (10-bit interleaved), and FD modes-enabling reuse across DSP platforms with varying bus widths. |
Applications
| Cable Modem Upstream Digitization | DSL Line Card Baseband Processing |
|---|---|
Use Scenario: Digitizing upstream RF signals (5–65 MHz) in DOCSIS-compliant cable modems after bandpass filtering and gain adjustment. IC Role / Device Role / Timing Role: Dual ADC performs simultaneous sampling of I/Q paths; internal PLL synchronizes ADC clock to upstream symbol timing. Use Value: 55.6 dB SINAD at 10 MHz input ensures >38 dB CNR for 256-QAM upstream transmission under real-world noise conditions. |
Use Scenario: Converting digital baseband symbols to analog line signals in ADSL2+ and VDSL2 line cards with echo cancellation. IC Role / Device Role / Timing Role: Dual DAC synthesizes transmit waveforms; 4× interpolation filters suppress image energy beyond 1104 kHz. Use Value: 60.8 dB SNR and –77.5 dBc THD enable >14-bit effective resolution for high-MSE line diagnostics and multi-tone testing. |
| Broadband LAN Access Point | Fixed Wireless Access Transceiver |
Use Scenario: Full-duplex baseband processing in IEEE 802.16e WiMAX base station remote radio heads with TDD/FDD switching. IC Role / Device Role / Timing Role: Independent Rx/Tx power-down pins allow rapid mode switching; flexible I/O adapts to OFDM symbol boundary alignment. Use Value: 80 dB crosstalk between ADC inputs prevents I/Q leakage during concurrent receive/transmit in TDD systems. |
Use Scenario: Transmitting and receiving 2.3–2.7 GHz LTE-FDD signals via direct-conversion architecture with external up/down mixers. IC Role / Device Role / Timing Role: ADC captures baseband I/Q after quadrature demodulation; DAC generates baseband I/Q for quadrature modulation. Use Value: 65.7 dBc SFDR (wideband) ensures clean spectral mask compliance for 20 MHz LTE channels with adjacent channel leakage ratio < –45 dBc. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixed-signal front-end applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9862BCPZ-50 | Includes integrated 12-bit ADCs (vs. 10-bit), higher 80 MSPS ADC sample rate, and enhanced SFDR (73.5 dBc vs. 65.7 dBc). | Targeted at higher-performance DOCSIS 3.1 upstream receivers requiring >10-bit ENOB at 50+ MSPS. | Select AD9862BCPZ-50 when system SNR budget demands >58 dB SINAD at 20 MHz input frequency. |
| AD9865BCPZ | Offers 12-bit ADCs, 100 MSPS max, and integrated 12-bit DACs; lacks auxiliary converters and has fixed 2× interpolation only. | Optimized for lower-cost xDSL CPE modems where auxiliary functions are handled externally and interpolation flexibility is not required. | Choose AD9865BCPZ for cost-sensitive residential gateways needing 12-bit precision but no on-chip system monitoring. |
Compared with AD9861BCP-50, AD9862BCPZ-50 delivers higher dynamic range for demanding upstream capture, while AD9865BCPZ trades auxiliary functionality and interpolation flexibility for lower unit cost and simpler configuration in fixed-architecture modems.
Availability
AD9861BCP-50 is available at Aetrix Electronics and suitable for broadband access infrastructure, DSL line card development, and fixed wireless access equipment requiring stable component supply and long-term industrial temperature support.
Supply support for AD9861BCP-50 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 technologies, serving communications, industrial, and automotive markets since 1965.
The AD9861 belongs to the MxFE™ (Mixed-Signal Front-End) product line, designed specifically for broadband communication infrastructure requiring tightly integrated, low-power, small-form-factor transceivers with programmable analog signal chains.
FAQ
What is the maximum ADC sampling rate supported by the AD9861BCP-50?
The AD9861BCP-50 supports a maximum ADC sampling rate of 50 MSPS, as specified in Table 2 of the Rev. A datasheet. This rate is optimized for upstream channel bandwidths in DOCSIS 2.0/3.0 cable modems and ADSL2+ systems. Exceeding this rate may degrade INL/DNL performance or cause timing violations in the Rx path.
Does the AD9861BCP-50 require an external reference voltage for the ADC?
No, the AD9861BCP-50 includes an internal 1.0 V bandgap reference for the ADC path, eliminating the need for an external reference IC. The REFT and REFB pins provide top/bottom reference connections, and VREF serves as the bandgap decoupling node-external capacitors are required per datasheet recommendations.
How does the AD9861BCP-50 manage power consumption in low-duty-cycle applications?
The AD9861BCP-50 provides three ADC power modes: normal (103 mA at 50 MSPS), low power (69 mA at 50 MSPS), and ultralow power (28 mA at 16 MSPS). These are controlled via the ADC_LO_PWR pin and register settings, allowing dynamic adaptation to traffic load without sacrificing signal integrity.
Can the AD9861BCP-50 operate in full-duplex mode with independent data buses?
Yes, the AD9861BCP-50 supports full-duplex operation using interleaved 10-bit data transfers on the same 20-bit I/O bus: U9–U0 carries interleaved ADC data while L9–L0 carries interleaved DAC data, synchronized by TxSYNC/RxSYNC signals per Figure 1 and Table 8.
What is the function of the FSADJ pin on the AD9861BCP-50?
The FSADJ pin on the AD9861BCP-50 adjusts the full-scale output current of the DACs by setting the RSET current reference. A 4.02 kΩ resistor between FSADJ and AGND yields 20 mA full-scale output; changing this resistor scales output linearly-critical for matching line driver requirements across different cable plant impedances.
AD9861BCP-50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Bag
- Product Status:
- Obsolete
- RF Type:
- WLL, WLAN
- Frequency:
- -
- Features:
- 10-Bit ADC(s), 10-Bit DAC(s)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 64-LFCSP-VQ (9x9)
AD9861BCP-50 FAQ
1.How can I place an order for AD9861BCP-50 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9861BCP-50 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 AD9861BCP-50 reliable?
The price and inventory of AD9861BCP-50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9861BCP-50 is usually 5 days.
3.What payment methods are accepted for AD9861BCP-50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9861BCP-50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9861BCP-50?
AD9861BCP-50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9861BCP-50 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 AD9861BCP-50?
For technical support, including AD9861BCP-50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9861BCP-50 requirements.
6.How does Aetrix verify that AD9861BCP-50 is sourced from the original manufacturer or authorized distributors?
All AD9861BCP-50 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 AD9861BCP-50 meets industry standards.
7.What is the process for return or replacement of AD9861BCP-50?
All AD9861BCP-50 units undergo pre-shipment inspection (PSI). If there is an issue with AD9861BCP-50, 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 AD9861BCP-50 part is unused and in its original packaging.
Return procedure for AD9861BCP-50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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