diff --git a/fast-servo/pyfastservo/dac.py b/fast-servo/pyfastservo/dac.py
index d1299f9..609fcf5 100644
--- a/fast-servo/pyfastservo/dac.py
+++ b/fast-servo/pyfastservo/dac.py
@@ -90,7 +90,7 @@ def manual_override(enable=True):
     to_write = reg_contents | 0b1 if enable else reg_contents & 0b110
     write_to_memory(CTRL_ADDR, to_write)
 
-def power_down(channel, power_down=True):
+def power_down_afe(channel, power_down=True):
     assert channel in (0, 1)
 
     bitmask = 1 << (channel + 1) & 0b111
@@ -137,6 +137,9 @@ def configure_ad9117():
             print("Unrecognized DAC version")
             return False
 
+        power_down_afe(0, True)
+        power_down_afe(1, True)
+
         configure_dac(spi)
         check_clk_relationship(spi)
         dac_self_calibration(spi)
@@ -144,8 +147,8 @@ def configure_ad9117():
         # Enable DAC outputs
         spi_write(spi, 0x01, spi_read(spi, 0x01) & ~((1 << 4) | (1 << 3)))
 
-        power_down(0, False)
-        power_down(1, False)
+        power_down_afe(0, False)
+        power_down_afe(1, False)
         manual_override(False)
 
         print("AD9117 configuration completed successfully")