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參數資料
| 型號： | AD9866CHIPS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通信及網絡 |
| 英文描述： | Broadband Modem Mixed Signal Front End |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, UUC |
| 文件頁數： | 27/48頁 |
| 文件大小： | 1647K |
| 代理商： | AD9866CHIPS |
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AD9866
TxPGA CONTROL
The AD9866 also contains a digital PGA in the Tx path distrib-
uted between the TxDAC and IAMP. The TxPGA is used to
control the peak current from the TxDAC and IAMP over a
7.5 dB and 19.5 dB span, respectively, with 0.5 dB resolution. A
6-bit word is used to set the TxPGA attenuation according to
the mapping shown in Figure 58. The TxDAC gain mapping is
applicable only when Bit 0 of Reg. 0x0E is set, and only the
4 LSBs of the 6-bit gain word are relevant.
Rev. 0 | Page 27 of 48
0
6-BIT DIGITAL CODE (Decimal Equivalent)
T
0
8
16
24
32
40
48
56
64
0
–20
–16
–17
–18
–19
–14
–15
–12
–13
–10
–11
–8
–9
–6
–7
–2
–3
–4
–5
–1
TxDACs IOUTP OUTPUT
HAS 7.5dB RANGE
IAMPs IOUTN AND IOUTG
OUTPUTS HAS 19.5dB RANGE
Figure 58. Digital Gain Mapping of TxPGA
The TxPGA register can be updated via the PGA[5:0] port or
SPI port. The first method should be considered for fast updates
of the TxPGA register. Its operation is similar to the description
in the RxPGA Control section. The SPI port allows direct
update and readback of the TxPGA register via Reg. 0x0A with
an update rate limited to 1.6 MSPS (SCLK = 32 MHz). Bit 6 of
Reg 0x0A must be set for a read or write operation. Table 17
lists the SPI registers pertaining to the TxPGA. The TxPGA
control register default setting is for minimum attenuation
(0 dBFS) with the PGA[5:0] port disabled for Tx gain control.
Table 17. SPI Registers TxPGA Control
Address (Hex)
Bit
Description
0x0A
(6)
Enable TxPGA update via SPI
(5:0)
TxPGA gain code
0x0B
(6)
Select TxPGA via PGA[5:0]
(5)
Select RxPGA via PGA[5:0]
0x0E
(0)
TxDAC output (IAMP disabled)
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相關代理商/技術參數 |
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| AD9866-EB | 制造商:Analog Devices 功能描述: 制造商:Analog Devices 功能描述:12B MXFE CONVERTER FOR BROADBAND MODEMS - Bulk |
| AD9867 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Broadband Modem Mixed-Signal Front End |
| AD9867BCPZ | 功能描述:IC MXFE 75MSPS FOR TX/RX 64LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 前端 (LNA + PA) 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:250 系列:- RF 型:GPS 頻率:1575.42MHz 特點:- 封裝/外殼:48-TQFP 裸露焊盤 供應商設備封裝:48-TQFP 裸露焊盤（7x7） 包裝:托盤 |
| AD9867BCPZRL | 功能描述:IC MXFE 75MSPS FOR TX/RX 64LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 前端 (LNA + PA) 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:250 系列:- RF 型:GPS 頻率:1575.42MHz 特點:- 封裝/外殼:48-TQFP 裸露焊盤 供應商設備封裝:48-TQFP 裸露焊盤（7x7） 包裝:托盤 |
| AD9867-EBZ | 制造商:Analog Devices 功能描述:12B MXFE CONVERTER FOR BROADBAND MODEMS - Bulk |
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