Electronic Components Datasheet Search |
|
AK2401 Datasheet(PDF) 5 Page - Asahi Kasei Microsystems |
|
AK2401 Datasheet(HTML) 5 Page - Asahi Kasei Microsystems |
5 / 103 page [AK2401] 017003093-E-00 2017/3 5 5. Block Diagram and Functions 5.1. Block Diagram Figure 1. AK2401 Block Diagram 5.2. Functions The AK2401 consists of the Analog Receiving Circuit 1 (LNA), the Analog Receiving Circuit 2 (MIXER, PGA and AAF), the Digital Receiving Circuit (ADC, DIGITAL FILTER, RSSI, AGC and ADC P/S IF), the Local Oscillation Circuit (PLL SYNTHESIZER, LOCAL BUFFER, LOCAL DIVIDER and CLOCK BUFFER), the Transmitting Data Generation Circuit (DAC S/P IF, DAC and SMOOTHING FILTER), the Transmitting Pre-amplifier Circuit (DRIVER AMP), the Reference Voltage Generation Circuit (VREF), the Internal Low Voltage Generation Circuit (LDO) and the Digital Control Circuit (DGITAL CONTROL). Analog Receiving Circuit 1 (LNA: Low Noise Linear Amplifier) Amplify received RF signal in low noise. An automatic gain controlling (AGC) function that automatically switches operation mode according to the input signal level is implemented to prevent degradation of distortion characteristics in strong input environment. An external matching circuit is needed at input/output of the LNA. An external filter can be added between the LNA and the MIXER blocks depending on the Image suppression characteristic demands. Analog Receiving Circuit 2 (MIXER, PGA, AAF) The direct conversion type MIXER down coverts RF signal that is amplified by LNA. The MIXER is operated by two local signals with 90 degrees phase difference, and it generates Ich/Qch baseband signal. A matching circuit is necessary at the MIXER input. The PGA (programmable gain amplifier) is composed by a first-order low-pass filter that is able to change the gain by register settings. It amplifies the dynamic range by keeping the input level of the ADC after this block. The PGA has an AGC function that changes PGA gain automatically according to input signal level. The AAF is composed by a third-order low-pass filter (Fc=100kHz). It is an anti-aliasing filter that prevents aliasing at the ADC after this block. An analog filter is composed by the PGA and the AAF reducing blocking signals on ADC input. LOCAL DIVIDER 1/(1,2,4,8) LNA LNACONT MIXER PGA AAF DIGITAL CONTROL DC OFFSET CAL DC OFFSET CAL 1/4 LNAIN DRIVER AMP RFOUT_N RFOUT_P BALUN BIAS1 BIAS2 VREF2 VREF1 TEST2 +90 0 FRACTIONAL-N PLL SYNTHESIZER ΔΣ MODULATOR R COUNTER PHASE FREQUENCY DETECTOR CHARGE PUMP N DIVIDER LOOP FILTER VCO LPF VREF LDO to power amplifier from antenna and/or top filter matching circuit and/or optional BPF AGC (LNA & PGA) I+ Q+ I- Q- RSSI MCU/DSP 24-bit ΔΣ ADC 24-bit ΔΣ ADC LOCAL BUFFER CLOCK BUFFER DIGITAL FILTER AD_SDO AD_SCLK AD_FS DA_SDI DA_SCLK DA_FS SMFOUT TEST1 MCU/ DSP to VCO modulation ADC P/S IF DAC S/P IF 12-bit DAC SMF |
Similar Part No. - AK2401 |
|
Similar Description - AK2401 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |