RF2958 RF Micro Devices, RF2958 Datasheet
RF2958
Available stocks
Related parts for RF2958
RF2958 Summary of contents
Page 1
... A minimum number of external components are required, resulting in an ultra-compact low-cost radio design. Two- cell or regulated three-cell (3.6V maximum) battery appli- cations are supported by the part. The RF2958 is also part of a 2.4GHz chipset along with our high-efficiency GaAs HBT PA and the RF3002 Baseband Processor. ...
Page 2
... RF2958 Absolute Maximum Ratings Parameter Supply Voltage Control Voltages Input RF Level Operating Ambient Temperature Storage Temperature Parameter Receiver LNA/RF RF Frequency Range IF Frequency Range Voltage Gain - High Voltage Gain - Low Noise Figure - High Gain Noise Figure - Low Gain Input IP3 - High Gain ...
Page 3
... RF2958 Unit Condition ns dB Transfer function - 3 pole Bessel at 9MHz Ω f<1MHz dB ° [(V -V )^2+(V QRT OUTI REF OUTQ mV VGC step 1.3V to 1.8V, P =-50dBm variation mA Source dB ° ...
Page 4
... RF2958 Parameter Digital Input Specifications Apply to pins: SSB, SDI, SCLK, MODE0, MODE1 Input High Voltage ( Input Low Voltage ( Input High Static Current ( Input Low Static Current ( Reset Time Apply to pins: SSB, SDI, SCLK Input Setup Time (T )* ...
Page 5
... Digital Timing Specifications T CS SSB SCLK SDI T Internal Recal pulse www.DataSheet4U.com Rev A0 050209 T T CWH CWL MSB T HLD SU RF2958 LSB T RC 11-267 ...
Page 6
... RF2958 Pin Function Description 1 IF IN+ Differential input from IF SAW filter. See application schematic for matching circuit IN- See pin 1. 3 VCC IF Power supply for IF circuitry. Provide 330pF bypass capacitor close to this pin BIAS Bandgap voltage reference for on-chip biasing. Install a 22.1kΩ, 1% resistor from this pin to ground ...
Page 7
... Rev A0 050209 Pin Out IN IN- 2 VCC BIAS 4 VCC RF2 5 VCC RF1 6 IF OUT OUT RF2958 VREF 23 DIG REG 22 VCC PLL4 21 SCLK 20 SSB 19 SDI 18 MCLK 17 MODE0 11-269 ...
Page 8
... RF2958 Detailed Functional Block Diagram 32 IF IN+ 1 3rd Order IF IN- 2 VCC BIAS 4 D/A VCC RF2 5 VCC RF1 6 IF OUT- 7 www.DataSheet4U.com IF OUT 11-270 3rd Order 3rd Order Bes LPF Bes LPF 3rd Order Bes LPF Bes LPF RX IF ...
Page 9
... When used with the RF3002 baseband processor and RF5189 power amplifier (PA), the RF2958 is part of a complete PHY solution for 802.11b appli- cations (see figure below, 2.4GHz IEEE 802.11b Chipset Block Diagram). ...
Page 10
... RF frequencies, and may be required on signal lines at IF frequencies if connections are long with respect to wavelength. The RF2958 should be powered from regulated supply. If not sharing this supply with the MCLK oscillator, the MCLK oscillator should also be powered from a well-regulated supply. Avoid sharing the RF2958 and MCLK oscillator supplies with the baseband processor and/or MAC ...
Page 11
... PA bias and the gain of the IF variable gain amplifier can be controlled by the RF2958 to reduce the current consumption of the PA, thereby increasing battery life. Contact RFMD Applications Engineering for guidance on implementing this feature. ...
Page 12
... The first bit in a serial transfer (the MSB) is the read/write (R/W) bit. R for a read, and R for a write. The figure below shows a timing diagram for a serial transfer to the RF2958 serial data interface. The serial select (SSB) pin is normally high. A serial transfer is initiated by taking SSB low. The address and data bits on the serial data in (SDI) pin are shifted in on rising edges of the serial clock (SCLK) pin, MSB first ...
Page 13
... PLL Prescaler Modulus 0=4/5 Mode 1=8/9 Mode 00000 Reserved, program to zero ( VCO Coarse Tuning Voltage LPF_V1=int (coarse tuning voltage/V RF2958 Function Divide by 2 1/2 high, 1/2 low Divide by 3 1/3 high, 2/3 low Divide by 44 1/44 high, 43/44 low Divide by 1 (bypass) Function )x16 DD 11-275 ...
Page 14
... RF2958 IF PLL Register 2 (IFPLL2)-Address 00010 Location Bit Name IFPLL2(17:16) Reserved IFPLL2(15:0) IF_N(15:0) IF PLL Register 3 (IFPLL3)-Address 00011 Location Bit Name IFPLL3(17) Reserved IFPLL3(16:8) DN1(16:8) IFPLL3(7:4) CT_DEF1(3:0) IFPLL3(3:0) KV_DEF1(3:0) RF PLL Register 4 (RFPLL1)-Address 00100 Location Bit Name RFPLL1(17) PLL_EN RFPLL1(16) KV_EN ...
Page 15
... Switches Between Single-Ended and Differential Mode 0=Single-ended mode 1=Differential mode 0 Input Buffer Enable TX 0=Input Buffer Controlled by TXEN 1=Input Buffer Controlled by BBEN 0 Internal Bias Enable 0=Disabled - External Bias Required 1=Enabled - Internal Bias Enabled 0 TX Baseband Filters Bypass 0=Not Bypassed 1=Bypassed RF2958 Function Function Function 11-277 ...
Page 16
... RF2958 Power Control Register 10 (PCNT1)-Address 01010 Location Bit Name PCNT1(17:15) MID_BIAS(2:0) PCNT1(14:9) P_DESIRED (5:0) PCNT1(8:3) PC_OFFSET (5:0) PCNT1(2:0) TX_DELAY (2:0) Power Control Register 11 (PCNT2)-Address 01011 Location Bit Name PCNT2(17:12) MAX_POWER (5:0) PCNT2(11:6) MID_POWER (5:0) PCNT2(5:0) MIN_POWER (5:0) VCOT1 Register 1 (VCOT1)-Address 01100 Location Bit Name ...
Page 17
... Demodulator Gain vs. RXVGC @ 25°C Demodulator Gain vs. RXVGC @ 70°C 1.6 1.7 1.8 1.9 2.0 RXVGC (V) OV1dB vs. Gain @ -30°C OV1dB vs. Gain @ 25°C OV1dB vs. Gain @ 70°C 30.0 40.0 50.0 60.0 70.0 80.0 1.00E+02 RF2958 Demodulator Input V1dB versus Gain versus Temperature 1000.0 IV1dB vs. Gain @ -30°C IV1dB vs. Gain @ 25°C IV1dB vs. Gain @ 70°C 100.0 10.0 1.0 0.1 -10.0 0.0 10.0 20.0 30.0 40.0 50.0 Demodulator Voltage Gain (dB) Demodulator Magnitude and Phase Error 0 ...
Page 18
... RF2958 Upconverter Gain versus Analog TXVGC 30.0 Upconverter Gain vs. TXVGC @ -30°C Upconverter Gain vs. TXVGC @ 25°C 25.0 Upconverter Gain vs. TXVGC @ 70°C 20.0 15.0 10.0 5.0 0.0 -5.0 -10.0 0.5 0.7 0.9 1.1 1.3 TXVGC (V) Upconverter P1dB versus Analog TXVGC 8.0 6.0 4.0 2.0 0.0 -2.0 -4.0 -6.0 www.DataSheet4U.com -8.0 0.5 0.7 0.9 1.1 1.3 TXVGC (V) Modulator Magnitude Error and Image Suppression 36.50 36.00 35.50 35.00 34.50 34.00 33.50 33.00 32.50 32.00 31.50 -12.0 -10.0 -8.0 -6.0 -4.0 -2.0 0.0 Baseband Frequency (MHz) 11-280 30.0 25.0 20.0 15.0 10.0 -5.0 -10.0 1.5 1.7 1.9 2.1 2.3 2.5 8.0 6.0 4.0 2.0 0.0 -2.0 -4.0 Upconverter Output P1dB vs. TXVGC @ -30°C Upconverter Output P1dB vs. TXVGC @ 25° ...
Page 19
... PCB Design Requirements A = 0.69 x 0.28 (mm) Typ 0.28 x 0.69 (mm) Typ 3.40 (mm) Sq. 3.50 (mm) Typ. 0.50 (mm) Typ. Pin Pin 0.63 (mm) Typ 1.75 (mm) 0.63 (mm) Typ. Typ. RF2958 B B Pin 1.75 (mm) A Typ. A 3.50 (mm) Typ Pin 16 11-281 ...
Page 20
... RF2958 PCB Solder Mask Pattern Liquid Photo-Imageable (LPI) solder mask is recommended. The solder mask footprint will match what is shown for the PCB Metal Land Pattern with a 3mil expansion to accommodate solder mask registration clearance around all pads. The center-grounding pad shall also have a solder mask clearance. Expansion of the pads to create solder mask clearance can be provided in the master data or requested from the PCB fabrication supplier ...