CONSUMER
15
GR70 Data Sheet Aug 26, 2003 v1.82
4.2.8
SPEAKER OUTPUTS
CH[7:1]+,-
Speaker Channel Outputs
These pins provide the Power Amplifier Outputs. Each channel of the amplifier is a full-bridge output
configuration. Each channel consists of a plus (+) and minus (-) output. The outputs must remain floating
and must not be connected to ground. Amplifier channels may be paralleled for additional power output
into lower impedance speakers. For example two output stages may be paralleled (plus to plus, minus to
minus) to deliver 140 Watts into 4
Ω.
When paralleled, the plus and minus outputs must never be
connected together or to ground and the input and volume controls must be set correctly.
5
AMPLIFIER OPERATION
5.1
OPERATING MODES
The GR70 amplifier module with the second zone option may be operated in a seven channel configuration or a dual zone
configuration. The dual zone configuration has 5 primary channels and a 2 channel (stereo) second zone. The Z2_EN input selects
the configuration, when high the dual zone operationis selected.
In the seven channel configuration, all seven amplifier outputs are assigned to the primary channels. Zone 2 is disabled. All input
sources are the I
2
S digital inputs (SDI[4:1]). The audio channel data is also available on the digital output port (SDO[4:1]).
In dual zone configuration, five audio channels are assigned to the primary channels with two channels for the second zone. The
amplifier primary channel outputs are assigned to digital audio inputs, SDI[4,2,1]. Amplifier outputs five and six are assigned as a
second zone, Zone 2. Two audio input sources are available for driving this second zone amplifier output, analog audio inputs
Z2_AD_R,L or the Zone 2 Serial Data input, Z2_SDI. The selection of analog or digital input is controlled by the state of
Z2_AD_EN. When Zone 2 is enabled, input and output channels are mapped to channels five and six. The Zone 2 speaker outputs
are on CH5/Z2L_OUT and CH6/Z2R_OUT.
The primary channels remain on the digital outputs, SDO[4,2,1], but the Zone 2 channels are not available on the digital audio
output.
The following table summarizes the input to output channel mapping.
5.2
ZONE 2 CONFIGURATION
The MD0 and MD1 inputs provide for independent operation of the speaker outputs when in dual zone configuration. The use of
MD0 and MD1 are configuration register specific and may cause undesirable operation of the GR70
if used outside of the described
procedures. Table 18 lists a definition of terms used in the Zone 2 Configuration.
1
10
Only second zone control
1
01
Only primary zone control
x
00
Illegal
Z2_EN
Z2_AD_EN
Primary Input
Zone 2
Input
Output CH1-4,7
Output CH5,6
0
0
SDI[4:1]
Disabled
Primary
Primary
1
0
SDI[4,2,1]
Digital
Primary
Zone 2
1
1
SDI[4,2,1]
Analog
Primary
Zone 2
TABLE 17: Amplifier Channel Mapping
Term
MD0,MD1,Z2_AD_EN,Z2_EN
Configuration Pins
Control Register
SET
High Level Voltage (3.3V)
Logic 1
CLEAR(ED)
Low Level Voltage (0V)
Logic 0
TABLE 18: Definition of Terms
Z2_EN
MD[1,0]
Configuration Access
Table 16: MD Input Control of Configuration Access
D
PR1005/DPR2005
harman/kardon
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