Low Power 4-In/6-Out HD Audio Codec with Headphone Amp
- click image to enlarge
The CS4207 is Cirrus Logic’s first HD audio codec. HD audio stands for high-definition audio, and is in this context indicating the next generation AC’97 standard defined by Intel for computer audio.
The CS4207 offers a high level of integration with four A/D converters and 6 D/A
converters. The device offers two stereo analog line inputs or microphone inputs featuring mic pre-amp and programmable gain amplifier (PGA). On the output side, the CS4207 supports 2 stereo analog channels for speaker outputs and a stereo ground-centered headphone amplifier, which removes the need for DC blocking caps and provides a pop free headphone output.
On the digital side, the CS4207 is the only HD audio device on the market with integrated Sample Rate Convertors, using Cirrus Logic’s highly regarded SRC technology. The CS4207 offers one SPDIF input with an integrated Sample Rate Convertor to synchronize clocks with the HD bus and two SPDIF outputs to connect to an external SPDIF source as well as HDMI.
The CS4207 combines key selling points that include lowest power consumption, highest performance and smallest package for applications such as mobile internet devices and PC-based industrial and automotive systems.
The CS4207 is not intended to target the low cost mass market. As always, Cirrus Logic focuses on high audio quality and very low power consumption, aiming at applications that are power sensitive, need a higher level of audio quality and reliability. It has the lowest power consumption of today’s HD audio codecs, only using 64mW in playback, and is compatible with Intel’s ECR HDA015 power management standard.
Currently it is the only HD audio codec qualified for automotive applications. The CS4207 is also a good fit for PC-based automotive systems such as telematics because it is multichannel, has a wide array of audio I/O’s, and it provides great audio quality.
The small package of the CS4207 is also an advantage. It is only 0.75mm in height, which is half of its competitors. This allows for better heat dissipation in confined spaces, while it intrinsically generates less heat through lower power consumption.
CS4207 Key Specifications
Digital to Analog Features
- DAC1 (Headphone/Line Out)
- 105 dB Dynamic Range (A-wtd),
- -95 dB THD+N
- Headphone Amplifier - GND Centered
- Integrated Negative Voltage Regulator
- No DC-Blocking Capacitor Required
- 44 mW Power/Channel into 16 Ω
- DAC2 & DAC3 (Line Outs)
- 108 dB Dynamic Range (A-wtd),
- -95 dB THD+N
- Differential Balanced or Single-Ended
- Each DAC Supports 32 kHz to 192 kHz Sample Rates Independently.
- Digital Volume Control
- +6.0 dB to -57.5 dB in 0.5 dB Steps
- Zero Cross and/or Soft Ramp Transitions
- Independent Support of D0 and D3 Power States for Each DAC
- Fast D3 to D0 Transition
- Audio Playback in Less Than 50 ms
Analog to Digital Features
- ADC1 & ADC2
- 105 dB Dynamic Range (A-wtd),
- -92 dB THD+N
- Differential Balanced or Single-Ended Inputs
- Analog PGA +/-12dB, 1.0dB Steps, with Zero Cross Transitions and Mute
- MIC Inputs
- Pre Amp with Selectable 0 dB, +10 dB, +20 dB, and +30 dB gain settings
- Programmable, Low Noise MIC Bias Level
- Each ADC Supports 8 kHz to 96 kHz Sample Rates Independently
- Additional Digital Attenuation Control
- -13.0 dB to -51.0 dB in 1.0 dB steps
- Zero Cross and/or Soft Ramp Transitions
- Digital Interface for Two Dual Digital Mic Inputs
- Independent Support of D0 and D3 Power States for Each ADC
Digital Audio Interface Receiver
- Complete EIAJ CP1201, IEC-60958, S/PDIF Compatible Receiver
- 32 kHz to 192 kHz Sample Rate Range
- Automatic Detection of Compressed Audio Streams
- Integrated Sample Rate Converter
- 128 dB Dynamic Range
- -120 dB THD+N
- Supports Sample Rates up to 192 kHz
- 1:1 Input/Output Sample Rate Ratios
Digital Audio Interface Transmitter
- Complete EIAJ CP1201, IEC-60958, S/PDIF Compatible Transmitter
- 32 kHz to 192 kHz Sample Rate Range
System Features
- Very Low D3 Power Dissipation of <7mW
- Jack Detect Active in D3
- HDA Bus BITCLK not required for D3 State
- Jack Detect Does not Require HDA Bus BITCLK
- All Configuration Settings are Preserved in D3 State
- Pop/Click Suppression in State Transitions
- Detects Wake Event and Generates Power State Change Request when HDA Bus Controller is in D3
- Variable Power Supplies
- 1.5 V to 1.8 V Digital Core Voltage
- 3.3 V to 5.0 V Analog Core Voltage
- 3.3 V to 5.0 V Headphone Drivers
- 1.5 V to 3.3 V HD Bus Interface Logic
- 3.3 V Interface Logic levels for GPIO, S/PDIF and Digital Mic.
- Individual Power-Down Managed
- ADCs, DACs, PGAs, Headphone Driver, S/PDIF Receiver and Transmitter
Driver Software
Supported OS’es
- Windows XP, Vista and 7
- Linux 2.6.27 (RedHat, Ubuntu, Debian)