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參數(shù)資料
| 型號(hào)： | CS4202-JQZR |
| 廠商： | Cirrus Logic Inc |
| 文件頁數(shù)： | 17/66頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CODEC AUDIO '97 48-TQFP |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 類型： | 音頻編解碼器 '97 |
| 數(shù)據(jù)接口： | 串行 |
| 分辨率（位）： | 24 b |
| ADC / DAC 數(shù)量： | 1 / 1 |
| 三角積分調(diào)變： | 是 |
| 動(dòng)態(tài)范圍，標(biāo)準(zhǔn) ADC / DAC (db)： | 90 / 90 |
| 電壓 - 電源，模擬： | 4.75 V ~ 5.25 V |
| 電壓 - 電源，數(shù)字： | 4.75 V ~ 5.25 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-TQFP（9x9） |
| 包裝： | 帶卷 (TR) |
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Micrel, Inc.
MIC3001
August 2004
24
M9999-082404-A
hbwhelp@micrel.com or (408) 955-1690
Power ON and Laser Start-Up
When power is applied, the MIC3001 initializes its
internal registers and state machine. This process takes
tPOR, about 50ms. Following tPOR, analog-to-digital
conversions begin, serial communication is possible, and
the POR bit and data ready bits may be polled. The first
set of analog data will be available tCONV after tPOR.
MIC3001s are shipped from the factory with the output
enable bit, OE, set to zero, off. The MIC3001’s power-up
default state, therefore, is APC off, VBIAS, VMOD, and
SHDN outputs disabled. VBIAS, VMOD, and SHDN will
be floating (high impedance) and the laser diode, if
connected, will be off. Once the device is incorporated
into a transceiver and properly configured, the shutdown
states of SHDN, VBIAS and VMOD will be determined
by the state of the APC configuration and OE bits. Table
10, Table 11, and Table 12 illustrate the shutdown states
of the various laser control outputs versus the control
bits.
Configuration Bits
Shutdown State
OE
SPOL
SHDN
0
Don’t Care
Hi-Z
1
0
≈GND
1
≈VDD
Table 10. Shutdown State of SHDN vs.
Configuration Bits
VBIAS Shutdown State
OE
INV
BIASREF
VBIAS
0
Don’t Care
Hi-Z
1
Don’t Care
0
≈GND
1
Don’t Care
1
≈VDD
Table 11. Shutdown State of VBIAS vs.
Configuration Bits
VMOD Shutdown State
OE
MODREF
VMOD
0
Don’t Care
Hi-Z
1
0
≈GND
1
≈VDD
Table 12. Shutdown State of VMOD vs.
Configuration Bits
In order to facilitate hot-plugging, the laser diode is not
turned on until tINIT2 after power-on. Following tINIT2, and
assuming TXDISABLE is not asserted, the DACs will be
loaded with their initial values. Since tCONV is much less
than tINIT2, the first set of analog data, including
temperature,
is
available
at
tINIT2. Temperature
compensation will be applied to the DAC values if
enabled. APC will begin if OE is asserted. (If the output
enable bit, OE, is not set, the VMOD, VBIAS, and SHDN
outputs will float indefinitely.) Figure 8 shows the power-
up timing of the MIC3001. If TXDISABLE is asserted at
power-up, the VMOD and VBIAS outputs will stay in their
shutdown states following MIC3001 initialization. A/D
conversions will begin, but the laser will remain off.
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