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參數資料
| 型號： | AD9866-EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Broadband Modem Mixed Signal Front End |
| 中文描述： | 寬帶調制解調器混合信號前端 |
| 文件頁數： | 32/48頁 |
| 文件大小： | 1647K |
| 代理商： | AD9866-EB |
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AD9866
The amount of standing and signal-dependent current used to
bias the npn transistors is dependent on the peak current,
IOUT
PK
, required by the load. If the load is variable, determine
the worst case,
IOUT
PK
, and add 3 mA of margin to ensure that
the npn transistors remain in the active region during peak load
currents. The gain of the secondary path, G, and the TxDAC’s
standing current, I, can be set using the following equation:
Rev. 0 | Page 32 of 48
0
I (mA)
I
S
1
2
3
4
5
6
7
8
9
10
11
12
13
100
10
20
30
40
50
60
70
80
90
IAMPN OUTPUT
TxDACs AVDD
I
G
mA
IOUT
PK
=
+
3
Equation 6.
The voltage output driver exhibits a high output impedance, if
the bias currents for the npn transistors are removed. This
feature is advantageous in half-duplex applications (for example,
power lines) in which the Tx output driver must go into a high
impedance state while in Rx mode. If the AD9866 is configured
for the half-duplex mode (MODE = 0), the IAMP, TxDAC, and
interpolation filter are automatically powered down after a Tx
burst (via TXEN), thus placing the Tx driver into a high
impedance state while reducing its power consumption.
Figure 66. Current Consumption of TxDAC and IAMP in Current Mode
Operation with IOUTN Only (Default IAMP Settings)
0
I (mA)
I
S
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
100
110
120
130
140
150
10
20
30
40
50
60
70
80
90
IOUTN OUTPUT
IOUTG OUTPUT
TxDAC AVDD
IAMP CURRENT CONSUMPTION CONSIDERATIONS
The Tx path’s analog current consumption is an important
consideration when determining its contribution to the overall
on-chip power dissipation. This is especially the case in full-
duplex applications, where the power dissipation can exceed the
maximum limit of 1.66 W, if the IAMP’s IOUT
PK
is set to high.
The analog current consumption includes the TxDAC’s analog
supply (Pin 43) along with the standing current from the
IAMP’s outputs. Equation 2 and Equation 5 can be used to
calculate the power dissipated in the IAMP for the current and
voltage mode configuration. Figure 66 shows the current
consumption for the TxDAC and IAMP as a function of the
TxDAC’s standing current, I,
when only the IOUTN outputs are
used. Figure 67 shows the current consumption for the TxDAC
and IAMP as a function of the TxDAC’s standing current, I,
when the IOUTN and IOUTG outputs are used. Both figures
are with the default current mirror gain settings of N = 4 and
G = 12.
Figure 67. Current Consumption of TxDAC and IAMP in Current Mode
Operation with IOUTN Only (Default IAMP Settings)
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相關代理商/技術參數 |
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| 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 |
| AD9867-WAFER | 功能描述:IC MXFE 75MSPS FOR TX/RX 制造商:analog devices inc. 系列:* 零件狀態:上次購買時間 標準包裝:1 |
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