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參數(shù)資料
| 型號： | UAA3515AHL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 900 MHz analog cordless telephone IC |
| 中文描述： | TELECOM, CORDLESS, RF AND BASEBAND CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 X 1.40 MM, PLASTIC, LQFP-64 |
| 文件頁數(shù)： | 27/44頁 |
| 文件大?。?/td> | 180K |
| 代理商： | UAA3515AHL |
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2001 Dec 12
27
Philips Semiconductors
Product specification
900 MHz analog cordless telephone IC
UAA3515A
7.9.12
V
OLTAGE REFERENCE ADJUSTMENT
An internal 1.5 V bandgap voltage reference provides the voltage reference for the low battery detect circuits, the V
REG
voltage regulator, the VB reference and all internal analog references. In inactive mode, the adjustment is disabled.
Table 17
Voltage reference adjust register
7.9.13
T
EST MODE
Test mode bits are used only for test in production and application tuning. The test bits must be set to 0 for normal
operation. Out-of-lock of synthesizers RX or TX can be monitored indirectly on pin CDLBD: the width of the ‘glitch’ that
occurs with out-of-lock gives a direct indication of the phase error on the PLL RX and/or TX. To tune the external
inductors of the RX and TX VCOs, a defined division ratio has to be programmed into the dividers, and then the image
frequency of the VCO can be read on pin CDLBD. Test mode can also be used to check the division ratio: a frequency
can be forced on the VCO or crystal pins and the programmed frequency can be read on pin CDLBD. There is a
divide-by-2 stage before the CDLBD pin, therefore all frequencies are divided-by-2. When both charge pumps are in the
high-impedance state, the VCOs can be measured as stand alone.
Table 18
Test mode register
BIT 2
BIT 1
BIT 0
SELECT
NOMINAL VOLTAGE REFERENCE
7%
5%
3%
1%
1%
3%
5%
7%
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
2
3
4
5
6
7
BIT 2
BIT 1
BIT 0
SELECT
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
normal operation
XOR between internal signals ‘up’ and ‘down’ of the RX synthesizer
XOR between internal signals ‘up’ and ‘down’ of the TX synthesizer
XOR between internal signals ‘up’ and ‘down’ of the RX or TX synthesizers
reference divider output divided by 2
prescaler and main divider RX divided by 2
prescaler and main divider TX divided by 2
both synthesizer charge pumps are in high-impedance-state
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