diff --git a/host/tests/CMakeLists.txt b/host/tests/CMakeLists.txt
index cf5a480bf..95238799f 100644
--- a/host/tests/CMakeLists.txt
+++ b/host/tests/CMakeLists.txt
@@ -431,6 +431,14 @@ UHD_ADD_NONAPI_TEST(
     ${UHD_BINARY_DIR}/lib/ic_reg_maps
 )
 
+UHD_ADD_NONAPI_TEST(
+    TARGET ltc5594_test.cpp
+    EXTRA_SOURCES
+    ${UHD_SOURCE_DIR}/lib/usrp/common/ltc5594.cpp
+    INCLUDE_DIRS
+    ${UHD_BINARY_DIR}/lib/ic_reg_maps
+)
+
 UHD_ADD_NONAPI_TEST(
     TARGET adf535x_test.cpp
     EXTRA_SOURCES
diff --git a/host/tests/ltc5594_test.cpp b/host/tests/ltc5594_test.cpp
new file mode 100644
index 000000000..4c6983178
--- /dev/null
+++ b/host/tests/ltc5594_test.cpp
@@ -0,0 +1,32 @@
+//
+// Copyright 2026 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+#include <uhdlib/usrp/common/ltc5594.hpp>
+#include <boost/test/unit_test.hpp>
+#include <array>
+
+BOOST_AUTO_TEST_CASE(ltc5594_lo_matching_test)
+{
+    std::array<uint8_t, 24> mock_registers{};
+    auto mock_poke = [&mock_registers](
+                         uint8_t addr, uint8_t data) { mock_registers.at(addr) = data; };
+    auto mock_peek = [&mock_registers](uint8_t addr) { return mock_registers.at(addr); };
+
+    auto ltc5594 =
+        ltc5594_iface::make(std::move(mock_poke), std::move(mock_peek), "ltc5594_test");
+    BOOST_REQUIRE(ltc5594);
+
+    ltc5594->set_lo_matching(500e6);
+    BOOST_CHECK_EQUAL(static_cast<unsigned>(mock_registers[18]), 0x51U);
+    BOOST_CHECK_EQUAL(static_cast<unsigned>(mock_registers[19]), 0x5fU);
+
+    ltc5594->set_lo_matching(100e6);
+    BOOST_CHECK_EQUAL(static_cast<unsigned>(mock_registers[18]), 0x48U);
+    BOOST_CHECK_EQUAL(static_cast<unsigned>(mock_registers[19]), 0xe3U);
+
+    ltc5594->set_lo_matching(9.1e9);
+    BOOST_CHECK_EQUAL(static_cast<unsigned>(mock_registers[18]), 0x48U);
+    BOOST_CHECK_EQUAL(static_cast<unsigned>(mock_registers[19]), 0xe3U);
+}
\ No newline at end of file