SSM3582ACPZ-R7 datasheet(34/58 Pages) AD

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SSM3582A

Data Sheet

Rev. A | Page 34 of 58

Table 22. Limiter Modes

LIM_EN_x

VBAT_TRACK_x

Limiter

VBAT < VBAT_INF_x

VBAT > VBAT_INF_x

Comments

0 or 1

Not applicable

See Figure 77

Fixed

Use the set threshold

See Figure 76

Variable

Lowers the threshold

Use the set threshold

See Figure 78 and Figure 79

0 or 1

Fixed

Mutes the output

Use the set threshold

Not shown

Fixed

Use the set threshold

No limiting

See Figure 80 and Figure 81

Variable

Lowers the threshold

No limiting

See Figure 82 and Figure 83

INPUT LEVEL

LIMITER THRESHOLD SETTING

VBAT > VBAT_INF_x LIMITER

LIMITER THRESHOLD CHANGE FOR VBAT < VBAT_INF_x

CHANGE IN LIM THRESHOLD = N × (VBAT_INF_x – VBAT)

WHERE N = 1 TO 4, SET USING SLOPE BITS IN REG 0x0F, REG 0x12

LIM_EN_x = 01

VBAT_TRACK_x = 1

Figure 78. Limiter Fixed (LIM_EN_x = 01, VBAT_TRACK_x = 1)

VBAT

VBAT_INF_x

LIM_THRES_x

SLOPE

LIMITER THRESHOLD LOWERS

FOR VBAT < VBAT_INF_x

LIMITER THRESHOLD STAYS AT

THE SET VALUE FOR VBAT > VBAT_INF_x

Figure 79. Limiter Threshold vs. VBAT in Limiter Tracking Mode

(LIM_EN_x = 01, VBAT_TRACK_x = 1)

INPUT LEVEL

LIMITER THRESHOLD SETTING

NO CHANGE IN LIM THRESHOLD PER VBAT

AMPLIFIER CLIPPING LEVEL

LIM_EN_x = 11

VBAT_TRACK_x = 0

Figure 80. Limiter Example (LIM_EN_x = 11, VBAT_TRACK_x = 0)

VBAT

LIM_THRES_x

LIMITER THRESHOLD FIXED AT SET VALUE

AND DOES NOT TRACK VBAT

Figure 81. Limiter Fixed (LIM_EN_x = 11, VBAT_TRACK_x = 0)

INPUT LEVEL

LIMITER THRESHOLD SETTING

VBAT > VBAT_INF_x LIMITER IS NOT ACTIVE

LIMITER THRESHOLD CHANGE FOR VBAT < VBAT_INF

CHANGE IN LIM THRESHOLD = N × (VBAT_INF_x – VBAT)

WHERE N = 1 TO 4, SET USING SLOPE BIT IN REG 0x0F, REG 0x12

AMPLIFIER CLIPPING LEVEL

LIM_EN_x = 11

VBAT_TRACK_x = 1

Figure 82. Limiter Example (LIM_EN_x = 11, VBAT_TRACK_x = 1)

VBAT

VBAT_INF_x

SET LIM_THRES_x

SLOPE

LIMITER THRESHOLD LOWERS

FOR VBAT < VBAT_INF_x

LIMITER THRESHOLD INACTIVE FOR VBAT > VBAT_INF_x

Figure 83. Limiter Threshold vs. VBAT in Limiter Tracking Mode

(LIM_EN_x = 11, VBAT_TRACK_x = 1)

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