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参数资料
| 型号： | MC13180 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 通信及网络 |
| 英文描述： | 2.4 GHz Low Power Wireless Transceiver IC for Bluetooth⑩ Applications |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQCC48 |
| 封装： | PLASTIC, QFN-48 |
| 文件页数： | 42/58页 |
| 文件大小： | 992K |
| 代理商： | MC13180 |
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42
MC13180 Product Preview
MOTOROLA
Functional Description
4.31 Bandpass Filter (BPF)
The 6.0 MHz bandpass filter is used to block undesired channels. The filter is self
-
adjusting and is
calibrated during each receive cycle, based on an internally generated 6.0 MHz signal. The gain of the
filter is fixed at 4.0 dB.
The nominal pass band for the filter is 720 kHz. This deliberately low pass band can cause significant
intersymbol interference (ISI) issues for a GFSK modulated signal with a 1Mbit/s data rate. The
advantages are increased sensitivity, adjacent channel interference performance and ease of manufacture.
Due to this low pass band, a digitally implemented decoder scheme is utilized to eliminate ISI. This is
referenced as the JD/MLSE, and is incorporated into all Motorola Bluetooth basebands.
The BPF is enabled approximately 10
μ
s after the assertion of the RTXEN pin while programmed for
Receive mode and automatic tuning is complete after approximately 140
μ
s. It is disabled immediately
after the de
-
assertion of the RTXEN pin or during any Idle or Transmit mode.
4.32 Limiter with Received Signal Strength Indicator (RSSI)
The RSSI (received signal strength indicator) is integrated into the limiter. The RSSI ADC converts the
RSSI current into a 4
-
bit digital signal. When the RSSI enable (R4/6) and RSSI Read Enable (R9/8) are
both set, the 4
-
bit RSSI conversion value can be read from the MC13180 register map (R29/3
-
0) while in
Idle mode. The RSSI is updated approximately 40
μ
s after T
propFS
during a receive cycle (see Figure 12).
Enabling RSSI will result in additional current consumption as noted in the Receiver AC Electrical
Specifications. Figure 26 shows the RSSI conversion value versus the RF level input to the LNA at various
temperatures. Figure 27 shows the RSSI conversion versus the RF level at different power supplies.
4.33 Demodulator
The receiver in the MC13180 downconverts the RF signal and demodulates it. The demodulator takes the
IF signal from the limiter and delivers a baseband signal to an A/D converter (ADC). The 6
-
bit ADC uses
the Redundant Sign Digit (RSD) Cyclic architecture that samples the analog input at 4.0 Msamples/s. The
resulting demodulated data out of the MC13180 is a 24 Mbit/s, 2’s
-
complement serial bit stream. The start
of each 6
-
bit data stream is indicated by a frame sync (FS) signal. A 24 MHz clock output accompanies the
demodulated data.
Figure 26. RF Level versus RSSI at Temperature
Figure 27. RF Level versus RSSI at V
CC
RF
-40°C
0°C
R
T
A
= 85°C
25°C
55°C
-20°C
-40
1.0
RSSI CONVERSION VALUE
3.0
5.0
7.0
9.0
11
13
15
-45
-50
-55
-60
-65
-70
-75
R
3.1 V
2.5 and 2.7 V
T
A
= 25°C
-40
1.0
RSSI CONVERSION VALUE
3.0
5.0
7.0
9.0
11
13
15
-45
-50
-55
-60
-65
-70
-75
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