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| 型号： | CS42L55-CNZ |
| 厂商： | Cirrus Logic Inc |
| 文件页数： | 61/68页 |
| 文件大小： | 0K |
| 描述： | IC CODEC STER H-HDPN AMP 36QFN |
| 标准包装： | 490 |
| 类型： | 立体声音频 |
| 数据接口： | 串行 |
| 分辨率（位）： | 24 b |
| ADC / DAC 数量： | 1 / 1 |
| 三角积分调变： | 是 |
| 动态范围，标准 ADC / DAC (db)： | 95 / 99 |
| 电压 - 电源，模拟： | 1.65 V ~ 2.71 V |
| 电压 - 电源，数字： | 1.65 V ~ 2.71 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-QFN |
| 供应商设备封装： | 36-QFN-EP（5x5） |
| 包装： | 托盘 |
| 产品目录页面： | 754 (CN2011-ZH PDF) |
| 配用： | 598-1506-ND - BOARD EVAL FOR CS42L55 CODEC |
| 其它名称： | 598-1629 |
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MIC3000
Micrel
M9999-101204
64
October 2004
SY89307 5.0V/ 3.3V 2.5Gbps VCSEL Driver
The modulation level of the SY89307 driver is controlled by
the voltage applied to the VCTRL pin (Type (c) above). The
circuit shown in Figure 31 allows the MIC3000’s VMOD output
to control the SY89307’s output swing. VCTRL is simply the
DAC output voltage. The circuit operates as a DAC-con-
trolled voltage source. See section above on SY88912 for
RFLTR, CFLTR.
MODDAC
MODREF bit = 1
MIC3000
SY89307
RFLTR
1k
VEE
VCTRL
VCC
VMOD–
VDDA
VMOD+
GNDA
CFLTR
100nF
VDD
(1)
Note:
1.
Bypass capacitors not shown for clarity.
Figure 31. Controlling the SY89307
Modulation Current
Laser Drivers Programmed via a Sink Current
The modulation level of some laser diode drivers is controlled
by a current sourced out of the RSET pin (Type (b) above).
The circuit shown in Figure 32 allows the MIC3000’s VMOD
outputs to control the set current, ISET. The circuit operates as
a DAC-controlled current sink. The current sink is formed by
the VMOD buffer amplifier, external transistor, and current
sense resistor. The op-amp acts to force the voltage drop
across RSET to be equal to the DAC output voltage.
The current through RSET is therefore regulated as
IRSET = VMOD+/RSET. ISET is given by the equation:
I
VMOD
R1
SET
=
+
+
β
(8)
where
β is the DC gain of Q1
The higher the gain of the transistor, the closer ISET will be to
the current in RSET. RFLTR and CFLTR act to eliminate any
noise that might be present on VDDA or VMOD. The values
shown give a 100
s time constant. See section above on
SY88912 for RFLTR, CFLTR and SHDN.
MODDAC
MODREF bit = 1
MIC3000
LD Driver
RSET
ISET
IMOD
×23
RFLTR
1k
SHDN
/EN
GND
VDD
RSET
VMOD–
Optional - see text
VDDA
VMOD+
GNDA
Q1
2N3906
VDD(1)
CFLTR
100nF
Notes:
1.
Bypass capacitors not shown for clarity
Figure 32. Controlling the Modulation Current
via a Sink Current
Drivers With Monitor Outputs
Laser diode driver ICs have been introduced with monitor
outputs. These outputs provide ground-referred signals that
mirror critical signals like laser bias current, modulation
current or monitor photodiode current, an analog of transmit-
ted power. Generally, these outputs source a current into an
external resistor to generate a ground referenced voltage.
Using these outputs with the MIC3000 is straightforward
since the MIC3000’s VILD+/– and VMPD inputs are polarity
programmable,
Shutdown Output
The shutdown output, SHDN, can be used in two ways: as an
enable or on/off control for the laser driver IC, and/or to control
a redundant switch in the laser current path. The redundant
switch provides a means for the MIC3000 to shut off the laser
current even if the bias transistor or modulator is damaged or
fails. SHDN is active any time the MIC3000 shuts down the
laser, i.e., if the TXDISABLE function is asserted in hardware
or software, or if the fault detection circuits trigger laser
shutdown. The shutdown output, SHDN, is essentially a logic
output with programmable polarity. The programmable polar-
ity allows SHDN to drive either high-side or low-side switches
or active-high or active-low enable inputs without the need for
external inversion circuits. If an active-low and an active-high
shutdown signal are required, an external inverter will be
necessary. Examples of redundant switch circuits are shown
in Figure 33.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CS42L55-CNZR | 功能描述:接口—CODEC IC Ultra Low PWR Stereo Codec RoHS:否 制造商:Texas Instruments 类型: 分辨率: 转换速率:48 kSPs 接口类型:I2C ADC 数量:2 DAC 数量:4 工作电源电压:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-81 封装:Reel |
| CS42L55-DNZ | 功能描述:接口—CODEC Portble Stereo CODEC Class H HP Amp RoHS:否 制造商:Texas Instruments 类型: 分辨率: 转换速率:48 kSPs 接口类型:I2C ADC 数量:2 DAC 数量:4 工作电源电压:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-81 封装:Reel |
| CS42L55DNZR | 制造商:Cirrus Logic 功能描述:PORTABLE STEREO CODEC AND UNIQUE CLASS H HP AMP AUTO GRADE & - Tape and Reel |
| CS42L55-DNZR | 功能描述:接口—CODEC Portable Ster CODEC w/Class H HP Amp RoHS:否 制造商:Texas Instruments 类型: 分辨率: 转换速率:48 kSPs 接口类型:I2C ADC 数量:2 DAC 数量:4 工作电源电压:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-81 封装:Reel |
| CS42L56-CNZ | 功能描述:接口—CODEC IC 24Bit UltraLowPwr Ster Codec w/clH HP RoHS:否 制造商:Texas Instruments 类型: 分辨率: 转换速率:48 kSPs 接口类型:I2C ADC 数量:2 DAC 数量:4 工作电源电压:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-81 封装:Reel |
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