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SA8027
Datasheet
General description
The SA8027 BICMOS device integrates programmable dividers, charge pumps and phase comparators to implement phase-locked loops. The device is designed to operate from 3 NiCd cells, in pocket phones, with low current and nominal 3 V supplies.
The synthesizer operates at VCO input frequencies up to 2.5 GHz. The synthesizer has fully programmable main, auxiliary and reference dividers. All divider ratios are supplied via a 3-wire serial programming bus. The main divider is a fractional-N divider with programmable integer ratios from 512 to 65535.
Separate power and ground pins are provided to the charge pumps and digital circuits. The ground pins should be externally connected to prevent large currents from flowing across the die and causing damage. VDDCP must be equal to or greater than VDD.
The charge pump current (gain) is fully programmable, while ISET is set by an external resistance at the RSET pin (refer to section 1.5, Main Output Charge Pumps and Fractional Compensation Currents). The phase/frequency detector charge pump outputs allow for implementing a passive loop filter.
Features
- Low phase noise
- Low power
- Fully programmable main and auxiliary dividers
- Programmable Normal & Integral charge pumps outputs
- Fast Locking Adaptive mode design
- Internal fractional spurious compensation
- Hardware and software power down
- Split supply for VDD and VDDCP
- Loop filter bandwidth programmability
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| SA8027DH | SA8027DH | 9352 640 14512 | Volume production | SOT360-1
(TSSOP20) | Tube Dry Pack | Standard Marking | SA8027DH
| week 12, 2005 |
| SA8027DH | SA8027DH-T | 9352 640 14518 | Volume production | SOT360-1
(TSSOP20) | Reel Dry Pack, SMD, 13" | Standard Marking | SA8027DH
| week 12, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Order quantity | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|---|
| SA8027DH | 9352 640 14512 | 3.6000 | not available | ||||||
| SA8027DH | 9352 640 14518 | 3.6000 | NA | DIGI-KEY CORPORATION | 2,500 | 1/8/2009 | Buy online | Order samples | |
| NA | DIGI-KEY CORPORATION | 4,993 | 1/8/2009 | Buy online |
Applications
- 500 to 2500 MHz wireless equipment
- Cellular phones (all standards)
- WLAN
- Portable battery-powered radio equipment.
Design support
Application Notes
Support Documents
75015145;
Specialty Analog Audio Amplifiers (2005-07-01)Disclaimer
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